a(n) = [x^n] 1 + x*(1 + x^2*(1 + x^3*(1 + x^4*(1 + x^5*(1 + ...)^n)^n)^n)^n)^n.

A302693

a(n) = [x^n] 1 + x*(1 + x^2*(1 + x^3*(1 + x^4*(1 + x^5*(1 + ...)^n)^n)^n)^n)^n.

Terms

    a(0) =1a(1) =1a(2) =0a(3) =3a(4) =0a(5) =10a(6) =36a(7) =35a(8) =448a(9) =450a(10) =4600a(11) =13167a(12) =45408a(13) =240006a(14) =670124a(15) =3863835a(16) =13209088a(17) =60533974a(18) =268324056a(19) =1089776654a(20) =5328589520a(21) =22065836226a(22) =106289169448a(23) =481033496803

External references