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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 10 |
| 3 | 74 |
| 4 | 722 |
| 5 | 8786 |
| 6 | 128218 |
| 7 | 2182554 |
| 8 | 42456226 |
| 9 | 929093538 |
| 10 | 22590839466 |
| 11 | 604225121258 |
| 12 | 17630145814898 |
| 13 | 557285515817970 |
| 14 | 18970857530674554 |
| 15 | 691929648113663802 |
| 16 | 26919562120779248962 |
| 17 | 1112769248605003393858 |
| 18 | 48704349211392743606602 |
[1,2,10,74,722,8786,128218,2182554,42456226, 929093538,22590839466,604225121258,17630145814898, 557285515817970,18970857530674554, 691929648113663802,26919562120779248962, 1112769248605003393858,48704349211392743606602] |