A011963 - OEIS

A011963

Number of ferrites M_8Y_n that repeat after 6n+40 layers.

0, 2, 4, 10, 19, 44, 76, 150, 251, 432, 686, 1094, 1646, 2498, 3608, 5206, 7301, 10160, 13814, 18718, 24831, 32782, 42660, 55138, 70407, 89504, 112462, 140674, 174460, 215230, 263536, 321430, 389194, 469492, 563116, 672706, 799513, 947190, 1116536, 1312196, 1535822, 1791936, 2082956, 2414932, 2789610, 3214516, 3692688, 4231404, 4834914, 5512662, 6267912

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..51.

T. J. McLarnan, The numbers of polytypes in close-packings and related structures, Zeits. Krist. 155, 269-291 (1981).

MAPLE

A011963 := proc(n)

F(8, n) ; # F implemented in A011961

end proc:

seq( A011963(n), n=1..80); # R. J. Mathar, Jul 19 2026

CROSSREFS