Partial sums of A002419.

Terms

a(0) =0a(1) =1a(2) =11a(3) =51a(4) =161a(5) =406a(6) =882a(7) =1722a(8) =3102a(9) =5247a(10) =8437a(11) =13013a(12) =19383a(13) =28028a(14) =39508a(15) =54468a(16) =73644a(17) =97869a(18) =128079a(19) =165319a(20) =210749a(21) =265650a(22) =331430a(23) =409630a(24) =501930a(25) =610155a(26) =736281a(27) =882441a(28) =1050931a(29) =1244216