a(n) = T(4n,n), where T is the array in A026300.

A026304

a(n) = T(4n,n), where T is the array in A026300.

Terms

    a(0) =1a(1) =4a(2) =35a(3) =340a(4) =3484a(5) =36784a(6) =395922a(7) =4319172a(8) =47588100a(9) =528328108a(10) =5901043161a(11) =66233871972a(12) =746434573208

External references