login
A009977
Powers of 33.
6
1, 33, 1089, 35937, 1185921, 39135393, 1291467969, 42618442977, 1406408618241, 46411484401953, 1531578985264449, 50542106513726817, 1667889514952984961, 55040353993448503713, 1816331681783800622529, 59938945498865420543457, 1977985201462558877934081, 65273511648264442971824673
OFFSET
0,2
COMMENTS
Same as Pisot sequences E(1, 33), L(1, 33), P(1, 33), T(1, 33). Essentially same as Pisot sequences E(33, 1089), L(33, 1089), P(33, 1089), T(33, 1089). See A008776 for definitions of Pisot sequences.
The compositions of n in which each natural number is colored by one of p different colors are called p-colored compositions of n. For n >= 1, a(n) equals the number of 33-colored compositions of n such that no adjacent parts have the same color. - Milan Janjic, Nov 17 2011
FORMULA
G.f.: 1/(1-33*x). - Philippe Deléham, Nov 24 2008
a(n) = 33^n; a(n) = 33*a(n-1), n > 0; a(0)=1. - Vincenzo Librandi, Nov 21 2010
From Elmo R. Oliveira, Jul 08 2025: (Start)
E.g.f.: exp(33*x).
a(n) = A000244(n)*A001020(n) = A327926(n)/A000244(n). (End)
MATHEMATICA
33^Range[0, 20] (* Paolo Xausa, Jul 12 2025 *)
PROG
(Magma) [33^n: n in [0..100]]; // Vincenzo Librandi, Nov 21 2010
CROSSREFS
KEYWORD
nonn,easy
STATUS
approved