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Search: id:A073991
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| A073991 |
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Number of strings of length n over Z_6 with trace 3 and subtrace 2. |
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+0
24
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| 0, 4, 18, 48, 180, 1080, 7056, 44928, 286416, 1762560
(list; graph; listen)
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OFFSET
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1,2
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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, A073990, A073992, A073993, A073994.
Sequence in context: A045991 A114364 A027271 this_sequence A052642 A102928 A081528
Adjacent sequences: A073988 A073989 A073990 this_sequence A073992 A073993 A073994
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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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