Row sums of the triangular array at A249057.

Terms

a(0) =1a(1) =5a(2) =10a(3) =40a(4) =110a(5) =430a(6) =1420a(7) =5720a(8) =21340a(9) =89980a(10) =367400a(11) =1627120a(12) =7138120a(13) =33172040a(14) =154520080a(15) =751616800a(16) =3687498320a(17) =18719834320a(18) =96157299040a(19) =507993654080