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| n | a(n) |
|---|---|
| 1 | 140 |
| 2 | 440 |
| 3 | 1300 |
| 4 | 3648 |
| 5 | 10012 |
| 6 | 27368 |
| 7 | 75236 |
| 8 | 208976 |
| 9 | 577964 |
| 10 | 1596216 |
| 11 | 4408020 |
| 12 | 12176768 |
| 13 | 33645500 |
| 14 | 92967176 |
| 15 | 256849892 |
| 16 | 709617776 |
| 17 | 1960543660 |
| 18 | 5416680632 |
| 19 | 14965468916 |
| 20 | 41347189280 |
| 21 | 114235439996 |
| 22 | 315613828040 |
| 23 | 871989852740 |
[140,440,1300,3648,10012,27368,75236,208976, 577964,1596216,4408020,12176768,33645500,92967176, 256849892,709617776,1960543660,5416680632, 14965468916,41347189280,114235439996,315613828040, 871989852740] |