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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 6 |
| 3 | 20 |
| 4 | 62 |
| 5 | 140 |
| 6 | 306 |
| 7 | 536 |
| 8 | 938 |
| 9 | 1492 |
| 10 | 2306 |
| 11 | 3296 |
| 12 | 4722 |
| 13 | 6460 |
| 14 | 8830 |
| 15 | 11568 |
| 16 | 14946 |
| 17 | 18900 |
| 18 | 23926 |
| 19 | 29544 |
| 20 | 36510 |
| 21 | 44388 |
| 22 | 53586 |
| 23 | 63648 |
| 24 | 75674 |
| 25 | 88948 |
| 26 | 104374 |
| 27 | 121032 |
| 28 | 139966 |
| 29 | 160636 |
| 30 | 184466 |
| 31 | 209944 |
| 32 | 239050 |
| 33 | 270588 |
| 34 | 305478 |
| 35 | 342480 |
| 36 | 383370 |
| 37 | 427020 |
[0,0,6,20,62,140,306,536,938,1492,2306,3296,4722, 6460,8830,11568,14946,18900,23926,29544,36510, 44388,53586,63648,75674,88948,104374,121032, 139966,160636,184466,209944,239050,270588,305478, 342480,383370,427020] |