Antidiagonal sums of the convolution array A213762.

Terms

a(0) =1a(1) =8a(2) =31a(3) =90a(4) =225a(5) =516a(6) =1123a(7) =2366a(8) =4885a(9) =9960a(10) =20151a(11) =40578a(12) =81481a(13) =163340a(14) =327115a(15) =654726a(16) =1310013a(17) =2620656a(18) =5242015a(19) =10484810a(20) =20970481a(21) =41941908a(22) =83884851a(23) =167770830a(24) =335542885a(25) =671087096a(26) =1342175623a(27) =2684352786