Partial sums of A299257.

Terms

a(0) =1a(1) =6a(2) =18a(3) =40a(4) =76a(5) =132a(6) =214a(7) =325a(8) =469a(9) =652a(10) =878a(11) =1150a(12) =1474a(13) =1856a(14) =2298a(15) =2803a(16) =3379a(17) =4032a(18) =4762a(19) =5572a(20) =6472a(21) =7468a(22) =8558a(23) =9745a(24) =11041a(25) =12452a(26) =13974a(27) =15610a(28) =17374a(29) =19272