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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 17 |
| 3 | 98 |
| 4 | 610 |
| 5 | 2531 |
| 6 | 18580 |
| 7 | 72453 |
| 8 | 449494 |
| 9 | 2114440 |
| 10 | 10753594 |
| 11 | 48572844 |
| 12 | 272867295 |
| 13 | 1137441506 |
| 14 | 5834448870 |
| 15 | 27276382027 |
| 16 | 129389072144 |
| 17 | 576677550870 |
| 18 | 2884567552542 |
| 19 | 12401875640710 |
| 20 | 59474089385344 |
| 21 | 270438887909580 |
| 22 | 1230979340265033 |
| 23 | 5477371267093144 |
[1,1,17,98,610,2531,18580,72453,449494,2114440, 10753594,48572844,272867295,1137441506,5834448870, 27276382027,129389072144,576677550870, 2884567552542,12401875640710,59474089385344, 270438887909580,1230979340265033,5477371267093144] |