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Search: id:A136468
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| 1, 2, 8, 106, 4728, 697288, 341056672, 561635549128, 3172355531357504, 62573893999774791616, 4377792727679018712191744, 1100465546170585425117622597248, 1004426091768772936789017838438890496
(list; graph; listen)
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OFFSET
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0,2
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PROGRAM
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(PARI) {a(n)=local(M=matrix(n+2, n+2, r, c, binomial(r*2^(c-2), c-1)), P); P=matrix(n+2, n+2, r, c, binomial((r+1)*2^(c-2), c-1)); (P~*M~^-1)[n+2, 2]/2^n}
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CROSSREFS
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Cf. A136467; A136469.
Sequence in context: A052457 A119654 A008926 this_sequence A132523 A012554 A012665
Adjacent sequences: A136465 A136466 A136467 this_sequence A136469 A136470 A136471
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna (pauldhanna(AT)juno.com), Dec 31 2007
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