a(n) = sum of absolute-valued coefficients of (1+2*x-3*x^2)^n.

A084778

a(n) = sum of absolute-valued coefficients of (1+2*x-3*x^2)^n.

Terms

    a(0) =1a(1) =6a(2) =28a(3) =128a(4) =660a(5) =3016a(6) =13108a(7) =64112a(8) =304068a(9) =1332992a(10) =6514356a(11) =29341384a(12) =131904528a(13) =623547112a(14) =2990903464a(15) =13436119424a(16) =61647598484a(17) =284398511848

External references