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Search: id:A090359
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| 1, 1, 4, 40, 640, 13816, 374636, 12229364, 466769330, 20391705290, 1003264704212, 54885373562372, 3304609250020008, 217139910688424400, 15461303963210314980, 1185856988993966140380, 97466557932008735970465
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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See comments in A090358.
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PROGRAM
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(PARI) {a(n)=local(A); if(n<1, 0, A=1+x+x*O(x^n); for(k=1, n, B=subst(A^5, x, x/(1-x))/(1-x)+x*O(x^n); A=A-A^6+B); B=subst(A, x, x/(1-x))/(1-x)+x*O(x^n); polcoeff(B^(1/2), n, x))}
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CROSSREFS
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Cf. A090358.
Adjacent sequences: A090356 A090357 A090358 this_sequence A090360 A090361 A090362
Sequence in context: A052675 A141010 A141011 this_sequence A049308 A005431 A010792
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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), Nov 26 2003
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