A025123 a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = A001950 (upper Wythoff sequence), t = A023533.

0, 0, 2, 5, 7, 0, 0, 0, 2, 5, 7, 10, 13, 15, 18, 20, 23, 0, 2, 5, 7, 10, 13, 15, 18, 20, 23, 26, 28, 31, 34, 36, 39, 43, 49, 54, 59, 13, 15, 18, 20, 23, 26, 28, 31, 34, 36, 39, 41, 44, 47, 49, 52, 54, 59, 65, 69, 75, 81, 85, 91, 95, 101, 107, 111, 117, 123, 36, 39, 41, 44, 47, 49, 52, 54, 57, 60, 62