A023658 Convolution of odd numbers and A000201.

1, 6, 18, 40, 76, 129, 202, 298, 420, 572, 757, 978, 1239, 1543, 1893, 2292, 2743, 3250, 3816, 4444, 5137, 5898, 6731, 7639, 8625, 9693, 10846, 12087, 13419, 14845, 16369, 17994, 19723, 21560, 23508, 25570, 27749, 30048, 32471, 35021