A073990 - OEIS

A073990

Number of strings of length n over Z_6 with trace 3 and subtrace 1.

0, 0, 0, 24, 300, 1800, 9072, 48384, 272160, 1594080, 9722592, 60217344, 367960320, 2207761920, 13144674816, 78328332288, 468419708160, 2810518248960, 16894457846784, 101565116448768, 609985806796800, 3659790885120000, 21947538146863104, 131620960833896448

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OFFSET

1,4

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, A073984, A073985, A073986, A073987, A073988, A073989, A073991, A073992, A073993, A073994.

Sequence in context: A161931 A162366 A153782 * A056290 A056285 A162686

Adjacent sequences: A073987 A073988 A073989 * A073991 A073992 A073993

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