Partial sums of A011863.

Terms

a(0) =0a(1) =1a(2) =6a(3) =22a(4) =61a(5) =142a(6) =292a(7) =548a(8) =958a(9) =1583a(10) =2498a(11) =3794a(12) =5579a(13) =7980a(14) =11144a(15) =15240a(16) =20460a(17) =27021a(18) =35166a(19) =45166a(20) =57321a(21) =71962a(22) =89452a(23) =110188a(24) =134602a(25) =163163a(26) =196378a(27) =234794a(28) =278999a(29) =329624