Principal diagonal of the convolution array A213836.

Terms

a(0) =1a(1) =13a(2) =52a(3) =134a(4) =275a(5) =491a(6) =798a(7) =1212a(8) =1749a(9) =2425a(10) =3256a(11) =4258a(12) =5447a(13) =6839a(14) =8450a(15) =10296a(16) =12393a(17) =14757a(18) =17404a(19) =20350a(20) =23611a(21) =27203a(22) =31142a(23) =35444a(24) =40125a(25) =45201a(26) =50688a(27) =56602a(28) =62959a(29) =69775