Defined by Product 1/(1-x^k)^a_k, k=1..inf = 1+x+2*Sum(a_k*x^k, k=2..inf). 1, 2, 3, 9, 24, 76, 236, 785, 2634, 9106, 31870, 113371, 407438, 1479526, 5415700
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