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A128083
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Sum of squared coefficients of q in the q-analog of the odd double factorials.
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3
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1, 1, 3, 37, 1159, 66953, 6158021, 825889193, 152147002939, 36866098462221, 11368538145120143, 4347671960639941039, 2019396728684584627337, 1119792551093682455434255, 730724550040451849614251167
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OFFSET
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0,3
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LINKS
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PROG
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(PARI) {a(n)=if(n==0, 1, sum(k=0, n^2, polcoeff(prod(j=1, n, (1-q^(2*j-1))/(1-q)), k, q)^2))}
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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