Principal diagonal of the convolution array A213783.

Terms

a(0) =1a(1) =4a(2) =11a(3) =22a(4) =39a(5) =62a(6) =93a(7) =132a(8) =181a(9) =240a(10) =311a(11) =394a(12) =491a(13) =602a(14) =729a(15) =872a(16) =1033a(17) =1212a(18) =1411a(19) =1630a(20) =1871a(21) =2134a(22) =2421a(23) =2732a(24) =3069a(25) =3432a(26) =3823a(27) =4242a(28) =4691a(29) =5170