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Search: id:A132785
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| 1, 1, 1, 1, 2, 7, 40, 342, 4118, 66581, 1393998, 36722251, 1189340060, 46466456210, 2155486553918, 117137645018204, 7372271485024724, 532031521606758006, 43644205623323138712, 4038679603699275061593, 418716209086799704826908
(list; graph; listen)
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OFFSET
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0,5
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COMMENT
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Also equals (with offset) the row sums and right-most border of triangle A132784.
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PROGRAM
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(PARI) {a(n)=local(A=[1]); if(n==0, 1, for(i=1, n, B=Vec(Pol(A)/(1-x +x*O(x^(i*(i-1)/2)))); A=concat(vector(i), B)); A[n+1])}
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CROSSREFS
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Cf. A132784 (triangle), A132786 (column sums).
Sequence in context: A135082 A102317 A031973 this_sequence A064626 A137731 A008608
Adjacent sequences: A132782 A132783 A132784 this_sequence A132786 A132787 A132788
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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), Aug 29 2007
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