Partial sums of A051798.

Terms

a(0) =1a(1) =14a(2) =69a(3) =224a(4) =574a(5) =1260a(6) =2478a(7) =4488a(8) =7623a(9) =12298a(10) =19019a(11) =28392a(12) =41132a(13) =58072a(14) =80172a(15) =108528a(16) =144381a(17) =189126a(18) =244321a(19) =311696a(20) =393162a(21) =490820a(22) =606970a(23) =744120a(24) =904995a(25) =1092546a(26) =1309959a(27) =1560664