A152560 a(n) = A131205(A005578(n)).
1, 1, 3, 7, 37, 225, 2707, 47991, 1566965, 85002865, 8346008131, 1441358958439, 452666387604933, 257384373709193473, 268828878795481175283, 516988085848458847554135, 1844678455777198460320221077
Offset: 0
Keywords
Programs
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PARI
{a(n)=local(N=(2^(n+1)+3+(-1)^n)/6,X=x+O(x^N));polcoeff(1/((1-X)^2*prod(m=0,n-1,1-X^(2^m))),N-1)}
Comments