a(n) = [x^n] exp(Sum_{k>=1} x^k*(1 + (n - 3)*x^k)/(k*(1 - x^k)^4)).

A318121

a(n) = [x^n] exp(Sum_{k>=1} x^k*(1 + (n - 3)*x^k)/(k*(1 - x^k)^4)).

Terms

    a(0) =1a(1) =1a(2) =4a(3) =15a(4) =65a(5) =269a(6) =1205a(7) =5325a(8) =24064a(9) =108849a(10) =496790a(11) =2275492a(12) =10470720a(13) =48325984a(14) =223721404a(15) =1038182441a(16) =4828274432a(17) =22497132116a(18) =105001996350a(19) =490816448220

External references