a(n) = T(3n,n), where T is the array in A026268.

A026293

a(n) = T(3n,n), where T is the array in A026268.

Terms

    a(0) =1a(1) =2a(2) =14a(3) =106a(4) =834a(5) =6732a(6) =55289a(7) =459742a(8) =3858524a(9) =32618022a(10) =277326906a(11) =2369003910a(12) =20315879480a(13) =174798617778

External references