OFFSET
0,2
COMMENTS
Note that the denominator has 5 triangular numbers: 1, 3, 6, 10, and 15.
LINKS
Paolo Xausa, Table of n, a(n) for n = 0..849
Index entries for linear recurrences with constant coefficients, signature (35,-427,2193,-4500,2700).
FORMULA
a(n) = (15^(n+4) - 6*10^(n+4) + 14*6^(n+4) - 15*3^(n+4) + 6)/7560.
a(n) = 35*a(n-1) - 427*a(n-2) + 2193*a(n-3) - 4500*a(n-4) + 2700*a(n-5) for n > 4. - Chai Wah Wu, Aug 10 2020
MATHEMATICA
A2269410[n_] := (15^# - 6*10^# + 14*6^# - 15*3^# + 6)/7560 & [n + 4];
Array[A2269410, 20, 0] (* Paolo Xausa, Aug 11 2026 *)
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Yahia Kahloune, Jun 23 2013
EXTENSIONS
Offset changed to 0 by Paolo Xausa, Aug 11 2026
STATUS
approved