Central terms in irregular triangle A291845.

A291846

Central terms in irregular triangle A291845.

Terms

    a(0) =1a(1) =1a(2) =5a(3) =33a(4) =283a(5) =2995a(6) =37723a(7) =551047a(8) =9157923a(9) =170606547a(10) =3521075919a(11) =79741123539

External references