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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 49 |
| 4 | 376 |
| 5 | 1858 |
| 6 | 5696 |
| 7 | 16427 |
| 8 | 36992 |
| 9 | 78204 |
| 10 | 150672 |
| 11 | 277005 |
| 12 | 463624 |
| 13 | 776494 |
| 14 | 1212208 |
| 15 | 1845911 |
| 16 | 2749568 |
| 17 | 4023608 |
| 18 | 5654976 |
| 19 | 7915497 |
| 20 | 10730616 |
| 21 | 14487706 |
| 22 | 19290352 |
| 23 | 25343011 |
| 24 | 32580752 |
| 25 | 41959412 |
| 26 | 53240624 |
| 27 | 66913605 |
| 28 | 83330712 |
[0,0,49,376,1858,5696,16427,36992,78204,150672, 277005,463624,776494,1212208,1845911,2749568, 4023608,5654976,7915497,10730616,14487706, 19290352,25343011,32580752,41959412,53240624, 66913605,83330712] |