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Search: id:A073990
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| A073990 |
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Number of strings of length n over Z_6 with trace 3 and subtrace 1. |
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24
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OFFSET
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1,4
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LINKS
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F. Ruskey Number of strings over Z_6 of 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, A073991, A073992, A073993, A073994.
Sequence in context: A086941 A128598 A153782 this_sequence A056290 A056285 A010976
Adjacent sequences: A073987 A073988 A073989 this_sequence A073991 A073992 A073993
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KEYWORD
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easy,nonn
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AUTHOR
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Frank Ruskey, Nate Kube (fruskey(AT)cs.uvic.ca), Aug 16 2002
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