Row sums of triangle A321686.

Terms

a(0) =1a(1) =2a(2) =7a(3) =32a(4) =171a(5) =1110a(6) =8148a(7) =68500a(8) =637688a(9) =6592438a(10) =74324893a(11) =913096970a(12) =12092478469a(13) =172257496610