a(n) = Sum_{1 <= i < j <= n} (j-i)^3.

Terms

a(0) =0a(1) =1a(2) =10a(3) =46a(4) =146a(5) =371a(6) =812a(7) =1596a(8) =2892a(9) =4917a(10) =7942a(11) =12298a(12) =18382a(13) =26663a(14) =37688a(15) =52088a(16) =70584a(17) =93993a(18) =123234a(19) =159334a(20) =203434a(21) =256795a(22) =320804a(23) =396980a(24) =486980a(25) =592605a(26) =715806a(27) =858690a(28) =1023526a(29) =1212751