a(n) = Sum_{i=1..n} binomial(i+1,2)^4.

Terms

a(0) =1a(1) =82a(2) =1378a(3) =11378a(4) =62003a(5) =256484a(6) =871140a(7) =2550756a(8) =6651381a(9) =15802006a(10) =34776742a(11) =71791798a(12) =140366759a(13) =261917384a(14) =469277384a(15) =811379400a(16) =1359360681a(17) =2214396762a(18) =3517606762a(19) =5462416762a(20) =8309813083a(21) =12406965164a(22) =18209748140a(23) =26309748140a(24) =37466388765a(25) =52644875166