One-eighth of triangular numbers (integers only).

Terms

a(0) =0a(1) =15a(2) =17a(3) =62a(4) =66a(5) =141a(6) =147a(7) =252a(8) =260a(9) =395a(10) =405a(11) =570a(12) =582a(13) =777a(14) =791a(15) =1016a(16) =1032a(17) =1287a(18) =1305a(19) =1590a(20) =1610a(21) =1925a(22) =1947a(23) =2292a(24) =2316a(25) =2691a(26) =2717a(27) =3122a(28) =3150a(29) =3585