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A073984 Number of strings of length n over Z_6 with trace 2 and subtrace 1. 22
0, 1, 9, 36, 210, 1296, 7056, 40824, 262440, 1700352, 10478160, 62355744, 367960320, 2176782336, 12958657344, 77716392192, 468205557120, 2821109907456, 16960580969472, 101758315958784, 609954817881600, 3656220357427200, 21926486787222528, 131557435432187904 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Same as the number of strings of length n over Z_6 with trace 4 and subtrace 1.

LINKS

Table of n, a(n) for n=1..24.

Max Alekseyev, PARI/GP scripts for miscellaneous math problems

F. Ruskey Strings over Z_6 with given trace and subtrace

FORMULA

a(n; t, s) = a(n-1; t, s) + a(n-1; t+5, s+5t+1) + a(n-1; t+4, s+4t+4) + a(n-1; t+3, s+3t+3) + a(n-1; t+2, s+2t+2) + a(n-1; t+1, s+t+1) where t is the trace and s is the subtrace.

CROSSREFS

Cf. A073971, A073972, A073973, A073974, A073975, A073976, A073977, A073978, A073979, A073980, A073981, A073982, A073983, A073985, A073986, A073987, A073988, A073989, A073990, A073991, A073992, A073993, A073994.

Sequence in context: A110752 A094973 A038780 * A036907 A027381 A335783

Adjacent sequences:  A073981 A073982 A073983 * A073985 A073986 A073987

KEYWORD

easy,nonn

AUTHOR

Frank Ruskey and Nate Kube, Aug 16 2002

EXTENSIONS

Terms a(11) onward from Max Alekseyev, Apr 09 2013

STATUS

approved

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Last modified July 24 05:23 EDT 2021. Contains 346273 sequences. (Running on oeis4.)