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A073993
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Number of strings of length n over Z_6 with trace 3 and subtrace 4.
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22
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0, 0, 0, 24, 180, 1080, 7056, 48384, 308448, 1806624, 10349856, 60217344, 356638464, 2139830784, 12940881408, 78328332288, 472093588224, 2832561529344, 16960580969472, 101565116448768, 608795590588416, 3652649829734400, 21926115464435712, 131620960833896448
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OFFSET
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1,4
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LINKS
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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
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FORMULA
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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.
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CROSSREFS
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Cf. A073971, A073972, A073973, A073974, A073975, A073976, A073977, A073978, A073979, A073980, A073981, A073982, A073983, A073984, A073985, A073986, A073987, A073988, A073989, A073990, A073991, A073992, A073994.
Sequence in context: A297522 A165187 A052761 * A214310 A052758 A241434
Adjacent sequences: A073990 A073991 A073992 * A073994 A073995 A073996
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KEYWORD
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easy,nonn
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AUTHOR
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Frank Ruskey and Nate Kube, Aug 16 2002
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EXTENSIONS
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Terms a(11) onward from Max Alekseyev, Apr 09 2013
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STATUS
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approved
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