Partial sums of A299291.

Terms

a(0) =1a(1) =6a(2) =20a(3) =49a(4) =105a(5) =190a(6) =320a(7) =501a(8) =727a(9) =1026a(10) =1408a(11) =1853a(12) =2391a(13) =3026a(14) =3734a(15) =4579a(16) =5541a(17) =6620a(18) =7838a(19) =9201a(20) =10657a(21) =12328a(22) =14136a(23) =16123a(24) =18293a(25) =20658a(26) =23128a(27) =25905a(28) =28825a(29) =31994