Antidiagonal sums of the convolution array A213778.

Terms

a(0) =1a(1) =6a(2) =17a(3) =40a(4) =78a(5) =140a(6) =230a(7) =360a(8) =535a(9) =770a(10) =1071a(11) =1456a(12) =1932a(13) =2520a(14) =3228a(15) =4080a(16) =5085a(17) =6270a(18) =7645a(19) =9240a(20) =11066a(21) =13156a(22) =15522a(23) =18200a(24) =21203a(25) =24570a(26) =28315a(27) =32480a(28) =37080a(29) =42160