Partial sums of A299266.

Terms

a(0) =1a(1) =6a(2) =15a(3) =37a(4) =74a(5) =131a(6) =213a(7) =330a(8) =475a(9) =653a(10) =882a(11) =1163a(12) =1485a(13) =1862a(14) =2307a(15) =2821a(16) =3398a(17) =4043a(18) =4773a(19) =5598a(20) =6499a(21) =7481a(22) =8574a(23) =9779a(24) =11073a(25) =12470a(26) =13995a(27) =15649a(28) =17414a(29) =19295