(A209988)/4.

Terms

a(0) =0a(1) =0a(2) =13a(3) =29a(4) =91a(5) =123a(6) =171a(7) =219a(8) =315a(9) =363a(10) =459a(11) =539a(12) =667a(13) =763a(14) =907a(15) =971a(16) =1163a(17) =1291a(18) =1435a(19) =1579a(20) =1835a(21) =1931a(22) =2171a(23) =2347a(24) =2539a(25) =2699a(26) =2987a(27) =3131a(28) =3515a(29) =3739