Column 3 of triangle A113983; also a(n) = A113983(n+2,2) + [A113983^2](n+1,2).

A113986

Column 3 of triangle A113983; also a(n) = A113983(n+2,2) + [A113983^2](n+1,2).

Terms

    a(0) =1a(1) =4a(2) =13a(3) =43a(4) =153a(5) =603a(6) =2657a(7) =13111a(8) =72273a(9) =443147a(10) =3007077a(11) =22462571a(12) =183744033a(13) =1637653579a(14) =15828157233a(15) =165167123583

External references