A025115 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (odd natural numbers), t = A023533.

0, 0, 1, 3, 5, 0, 0, 0, 1, 3, 5, 7, 9, 11, 13, 15, 17, 0, 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 32, 36, 40, 44, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, 31, 33, 35, 37, 39, 41, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 84, 88, 92, 27, 29, 31, 33, 35, 37, 39, 41, 43, 45, 47, 49, 51, 53