A023666 Convolution of A000201 and A014306.
0, 1, 4, 7, 11, 18, 25, 34, 45, 56, 69, 83, 98, 116, 135, 155, 178, 201, 227, 253, 279, 308, 338, 370, 404, 438, 476, 514, 553, 596, 638, 683, 730, 777, 827, 876, 927, 981, 1034, 1092, 1149, 1208, 1269, 1331, 1396, 1462, 1528, 1599, 1669, 1741
Offset: 1