Binomial(n,4) - A290447(n).

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =0a(7) =0a(8) =2a(9) =10a(10) =30a(11) =50a(12) =88a(13) =126a(14) =176a(15) =256a(16) =374a(17) =492a(18) =651a(19) =810a(20) =1013a(21) =1285a(22) =1605a(23) =1925a(24) =2327a(25) =2794a(26) =3315a(27) =3921a(28) =4627a(29) =5333