Partial sums of A005587. Fourth column of triangle A115127.

Terms

a(0) =14a(1) =56a(2) =146a(3) =311a(4) =586a(5) =1015a(6) =1652a(7) =2562a(8) =3822a(9) =5522a(10) =7766a(11) =10673a(12) =14378a(13) =19033a(14) =24808a(15) =31892a(16) =40494a(17) =50844a(18) =63194a(19) =77819a(20) =95018a(21) =115115a(22) =138460a(23) =165430a(24) =196430a(25) =231894a(26) =272286a(27) =318101a(28) =369866a(29) =428141