A047882 a(n)=(1/2)*b(n), where b=A049648.

0, 5, 10, 19, 31, 50, 75, 110, 151, 205, 268, 346, 434, 540, 658, 797, 949, 1124, 1315, 1532, 1765, 2027, 2308, 2620, 2952, 3318, 3706, 4131, 4579, 5066, 5579, 6134, 6715, 7341, 7996, 8698, 9430, 10212, 11026, 11893, 12793, 13748