The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 8 |
| 4 | 28 |
| 5 | 88 |
| 6 | 186 |
| 7 | 378 |
| 8 | 660 |
| 9 | 1104 |
| 10 | 1700 |
| 11 | 2575 |
| 12 | 3660 |
| 13 | 5148 |
| 14 | 6972 |
| 15 | 9310 |
| 16 | 12096 |
| 17 | 15616 |
| 18 | 19656 |
| 19 | 24624 |
| 20 | 30330 |
| 21 | 37100 |
| 22 | 44770 |
| 23 | 53845 |
| 24 | 63888 |
| 25 | 75600 |
| 26 | 88608 |
| 27 | 103428 |
| 28 | 119756 |
| 29 | 138376 |
| 30 | 158550 |
| 31 | 181350 |
| 32 | 206160 |
| 33 | 233728 |
| 34 | 263568 |
| 35 | 296803 |
| 36 | 332316 |
| 37 | 371628 |
| 38 | 413820 |
| 39 | 459914 |
[0,0,0,8,28,88,186,378,660,1104,1700,2575,3660, 5148,6972,9310,12096,15616,19656,24624,30330, 37100,44770,53845,63888,75600,88608,103428,119756, 138376,158550,181350,206160,233728,263568,296803, 332316,371628,413820,459914] |