A023865 a(n) = s(1)t(n)+s(2)t(n-1)+...+s(k)t(n+1-k), where k=[ (n+1)/2 ], s = (natural numbers), t = (odd numbers).

1, 3, 11, 17, 38, 50, 90, 110, 175, 205, 301, 343, 476, 532, 708, 780, 1005, 1095, 1375, 1485, 1826, 1958, 2366, 2522, 3003, 3185, 3745, 3955, 4600, 4840, 5576, 5848, 6681, 6987, 7923, 8265, 9310, 9690, 10850, 11270, 12551, 13013, 14421, 14927, 16468, 17020, 18700, 19300