Partial sums of A299289.

Terms

a(0) =1a(1) =9a(2) =37a(3) =97a(4) =203a(5) =367a(6) =603a(7) =923a(8) =1341a(9) =1869a(10) =2521a(11) =3309a(12) =4247a(13) =5347a(14) =6623a(15) =8087a(16) =9753a(17) =11633a(18) =13741a(19) =16089a(20) =18691a(21) =21559a(22) =24707a(23) =28147a(24) =31893a(25) =35957a(26) =40353a(27) =45093a(28) =50191a(29) =55659