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A073985
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Number of strings of length n over Z_6 with trace 2 and subtrace 2.
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23
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0, 0, 3, 24, 180, 1296, 9072, 54432, 297432, 1658880, 9722592, 58576608, 356638464, 2173796352, 13162730688, 79012495872, 472093588224, 2821109907456, 16894457846784, 101366747080704, 608764662139392, 3656096522698752, 21947538146863104, 131685972252346368
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OFFSET
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1,3
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COMMENTS
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Same as the number of strings of length n over Z_6 with trace 4 and subtrace 2.
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LINKS
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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
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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, A073986, A073987, A073988, A073989, A073990, A073991, A073992, A073993, A073994.
Sequence in context: A058038 A089697 A120741 * A197209 A181967 A144087
Adjacent sequences: A073982 A073983 A073984 * A073986 A073987 A073988
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KEYWORD
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easy,nonn,changed
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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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