G.f. satisfies: A(x) = exp( Sum_{n>=1} [Sum_{k=0..2*n} T(n,k)^2 * x^k] / A(x)^n * x^n/n ), where T(n,k) is the coefficient of x^k in (1 + x + 2*x^2)^n.

A251687

G.f. satisfies: A(x) = exp( Sum_{n>=1} [Sum_{k=0..2*n} T(n,k)^2 * x^k] / A(x)^n * x^n/n ), where T(n,k) is the coefficient of x^k in (1 + x + 2*x^2)^n.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =5a(4) =8a(5) =8a(6) =16a(7) =28a(8) =48a(9) =80a(10) =128a(11) =208a(12) =320a(13) =512a(14) =768a(15) =1216a(16) =1792a(17) =2816a(18) =4096a(19) =6400a(20) =9216a(21) =14336a(22) =20480a(23) =31744a(24) =45056a(25) =69632a(26) =98304a(27) =151552a(28) =212992a(29) =327680

External references