G.f. A(x) satisfies A(x)^5 = A(x^5) + 5*A(x^6).

Terms

a(0) =1a(1) =1a(2) =-2a(3) =6a(4) =-21a(5) =80a(6) =-320a(7) =1327a(8) =-5641a(9) =24452a(10) =-107626a(11) =479595a(12) =-2158961a(13) =9801964a(14) =-44825612a(15) =206274835a(16) =-954379090a(17) =4436725739a(18) =-20712537332a(19) =97058595375a(20) =-456348299572