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A053562
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Number of ternary Lyndon words of length n with trace 1 and subtrace 0 over GF(3). Same as the number of ternary Lyndon words of length n with trace 2 and subtrace 0 over GF(3).
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5
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1, 1, 1, 2, 6, 13, 32, 87, 243, 654, 1782, 4914, 13664, 37994, 106288, 298890, 844182, 2391363, 6796160, 19369708, 55345784, 158489298, 454795398, 1307541690, 3765741324, 10862688116, 31381059609, 90780903460, 262951692390
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,4
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LINKS
| F. Ruskey, Ternary Lyndon words of given trace and subtrace over GF(3)
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FORMULA
| (1/n) Sum mu(d) M(n/d, 0, 1); d|n, d=1(3) + (1/n) Sum mu(d) M(n/d, 0, 2); d|n, d=2(3) where M(n, t, s) = Sum n!/(i!j!k!); i+j+k=n, j=t(3), k=s(3).
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EXAMPLE
| a(4) = 3 = |{ 0001, 1222 }|
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CROSSREFS
| Cf. A053548, A053560, A053561, A053563, A053564.
Sequence in context: A018013 A062424 A099232 * A003039 A109385 A098407
Adjacent sequences: A053559 A053560 A053561 * A053563 A053564 A053565
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KEYWORD
| nonn
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AUTHOR
| Frank Ruskey (ruskey(AT)cs.uvic.ca), Jan 17 2000
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