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A073973 Number of strings of length n over Z_6 with trace 0 and subtrace 2. 22
0, 2, 6, 24, 180, 1440, 9072, 50544, 286416, 1658880, 9722592, 58335552, 356638464, 2179768320, 13180786560, 79012495872, 472093588224, 2821539889152, 16894457846784, 101356447675392, 608733733690368, 3656096522698752, 21947538146863104, 131685228881178624 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

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

F. Ruskey Number of strings over Z_6 of given trace and subtrace

_Max Alekseyev_, PARI/GP scripts for miscellaneous math problems

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, A073974, A073975, A073976, A073977, A073978, A073979, A073980, A073981, A073982, A073983.

Cf. A073984, A073985, A073986, A073987, A073988, A073989, A073990, A073991, A073992, A073993, A073994.

Sequence in context: A012361 A121773 A012711 * A034874 A052699 A074351

Adjacent sequences:  A073970 A073971 A073972 * A073974 A073975 A073976

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 October 20 07:01 EDT 2014. Contains 248329 sequences.