A diagonal of triangle A228904.

A228906

A diagonal of triangle A228904.

Terms

    a(0) =1a(1) =2a(2) =7a(3) =62a(4) =1031a(5) =24782a(6) =774180a(7) =29763855a(8) =1359654560a(9) =71984907423

External references