A023661 Convolution of odd numbers and A014306.
0, 1, 4, 8, 13, 20, 29, 40, 53, 67, 82, 99, 118, 139, 162, 187, 214, 243, 274, 306, 339, 374, 411, 450, 491, 534, 579, 626, 675, 726, 779, 834, 891, 950, 1010, 1071, 1134, 1199, 1266, 1335, 1406, 1479, 1554, 1631, 1710, 1791, 1874, 1959, 2046
Offset: 1