Partial sums of A299256.

Terms

a(0) =1a(1) =7a(2) =25a(3) =65a(4) =137a(5) =249a(6) =411a(7) =631a(8) =919a(9) =1283a(10) =1733a(11) =2277a(12) =2925a(13) =3685a(14) =4567a(15) =5579a(16) =6731a(17) =8031a(18) =9489a(19) =11113a(20) =12913a(21) =14897a(22) =17075a(23) =19455a(24) =22047a(25) =24859a(26) =27901a(27) =31181a(28) =34709a(29) =38493