Central terms of triangle A181544.

A183204

Central terms of triangle A181544.

Terms

    a(0) =1a(1) =4a(2) =48a(3) =760a(4) =13840a(5) =273504a(6) =5703096a(7) =123519792a(8) =2751843600a(9) =62659854400

External references