a(n) = [x^(n^n)] Product_{k>=1} 1 / (1 - x^(k^n)).

A331402

a(n) = [x^(n^n)] Product_{k>=1} 1 / (1 - x^(k^n)).

Terms

    a(0) =1a(1) =2a(2) =5a(3) =36a(4) =1104a(5) =140549a(6) =82159688a(7) =237700614212

External references