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Search: id:A136469
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| 1, 4, 36, 972, 82692, 22668224, 20480767016, 62399482333360, 654732295896172624, 24092174555680443592896, 3156168229958886081384337440, 1490220874303979634022445823087616
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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+3, n+3, r, c, binomial(r*2^(c-2), c-1)), P); P=matrix(n+3, n+3, r, c, binomial((r+1)*2^(c-2), c-1)); (P~*M~^-1)[n+3, 3]/4^n}
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CROSSREFS
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Cf. A136467; A136468.
Sequence in context: A134052 A127901 A061742 this_sequence A120605 A143764 A152287
Adjacent sequences: A136466 A136467 A136468 this_sequence A136470 A136471 A136472
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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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