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A073973
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Number of strings of length n over Z_6 with trace 0 and subtrace 2.
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23
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OFFSET
| 1,2
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LINKS
| F. Ruskey Number of strings over Z_6 of given trace and subtrace
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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.
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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
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KEYWORD
| easy,nonn
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AUTHOR
| Frank Ruskey, Nate Kube (ruskey(AT)cs.uvic.ca), Aug 16 2002
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