Binomial(max(n,R(n)),min(n,R(n))) where R(n) is the reversal of n.

A071938

Binomial(max(n,R(n)),min(n,R(n))) where R(n) is the reversal of n.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =1a(7) =1a(8) =1a(9) =10a(10) =1a(11) =293930a(12) =206253075a(13) =35240152720a(19) =190a(20) =293930a(21) =1a(22) =28048800a(23) =353697121050

External references