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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 16032 |
| 4 | 292776 |
| 5 | 1400168 |
| 6 | 3807828 |
| 7 | 7700944 |
| 8 | 13082348 |
| 9 | 19910456 |
| 10 | 28160124 |
| 11 | 37824352 |
| 12 | 48902340 |
| 13 | 61394088 |
| 14 | 75299596 |
| 15 | 90618864 |
| 16 | 107351892 |
| 17 | 125498680 |
| 18 | 145059228 |
| 19 | 166033536 |
| 20 | 188421604 |
| 21 | 212223432 |
| 22 | 237439020 |
| 23 | 264068368 |
| 24 | 292111476 |
[0,0,16032,292776,1400168,3807828,7700944, 13082348,19910456,28160124,37824352,48902340, 61394088,75299596,90618864,107351892,125498680, 145059228,166033536,188421604,212223432,237439020, 264068368,292111476] |