Diagonal sums of number array A082105.

Terms

a(0) =1a(1) =2a(2) =8a(3) =28a(4) =79a(5) =190a(6) =406a(7) =792a(8) =1437a(9) =2458a(10) =4004a(11) =6260a(12) =9451a(13) =13846a(14) =19762a(15) =27568a(16) =37689a(17) =50610a(18) =66880a(19) =87116a(20) =112007a(21) =142318a(22) =178894a(23) =222664a(24) =274645a(25) =335946a(26) =407772a(27) =491428a(28) =588323a(29) =699974