Row sums of convolution triangle A030523.

Terms

a(0) =1a(1) =4a(2) =15a(3) =55a(4) =200a(5) =725a(6) =2625a(7) =9500a(8) =34375a(9) =124375a(10) =450000a(11) =1628125a(12) =5890625a(13) =21312500a(14) =77109375a(15) =278984375a(16) =1009375000a(17) =3651953125a(18) =13212890625a(19) =47804687500a(20) =172958984375a(21) =625771484375