Define a(x,y) to be 1 if x is 0 or 1 and y*a(x-1,y)-a(x-2,y) otherwise. Then the n-th term of the sequence is a(n,n).

A218219

Define a(x,y) to be 1 if x is 0 or 1 and y*a(x-1,y)-a(x-2,y) otherwise. Then the n-th term of the sequence is a(n,n).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =5a(4) =41a(5) =436a(6) =5741a(7) =90481a(8) =1663585a(9) =34988311a(10) =828931049a(11) =21851881930a(12) =634556225161

External references