G.f. A(x) satisfies -3*x = Product_{n>=1} (1 - x^n/A(x)) * (1 - x^(n-1)*A(x)) * (1 + x^n).
A384273
G.f. A(x) satisfies -3*x = Product_{n>=1} (1 - x^n/A(x)) * (1 - x^(n-1)*A(x)) * (1 + x^n).
Terms
- a(0) =1a(1) =3a(2) =3a(3) =9a(4) =39a(5) =108a(6) =387a(7) =1581a(8) =5196a(9) =21573a(10) =82596a(11) =318279a(12) =1303146a(13) =5182389a(14) =20919156a(15) =86577264a(16) =351929133a(17) =1462075095a(18) =6077250693a(19) =25277372124a(20) =106131459906a(21) =445859648019
External references
- oeis: A384273