Number of distinct lines through the origin in 4-dimensional cube of side length n.

Terms

a(0) =0a(1) =15a(2) =65a(3) =225a(4) =529a(5) =1185a(6) =2065a(7) =3745a(8) =5841a(9) =9105a(10) =13025a(11) =19105a(12) =25521a(13) =35361a(14) =45825a(15) =59905a(16) =75425a(17) =96865a(18) =117841a(19) =147505a(20) =177041a(21) =214961a(22) =254401a(23) =306321a(24) =355249a(25) =420929a(26) =485489a(27) =565265a(28) =645377a(29) =748081