Antidiagonal sums of the convolution array A213844.

Terms

a(0) =3a(1) =23a(2) =90a(3) =250a(4) =565a(5) =1113a(6) =1988a(7) =3300a(8) =5175a(9) =7755a(10) =11198a(11) =15678a(12) =21385a(13) =28525a(14) =37320a(15) =48008a(16) =60843a(17) =76095a(18) =94050a(19) =115010a(20) =139293a(21) =167233a(22) =199180a(23) =235500a(24) =276575a(25) =322803a(26) =374598a(27) =432390a(28) =496625a(29) =567765