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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 33 |
| 4 | 148 |
| 5 | 681 |
| 6 | 3207 |
| 7 | 15307 |
| 8 | 73822 |
| 9 | 358559 |
| 10 | 1751143 |
| 11 | 8587649 |
| 12 | 42250473 |
| 13 | 208397918 |
| 14 | 1030017125 |
| 15 | 5099350476 |
| 16 | 25279913728 |
| 17 | 125465667926 |
| 18 | 623278510259 |
| 19 | 3098721059515 |
| 20 | 15416066743763 |
| 21 | 76738380083743 |
| 22 | 382176833557163 |
| 23 | 1904142981324656 |
| 24 | 9490603393188092 |
| 25 | 47318029786249952 |
| 26 | 235982999815553655 |
[1,2,8,33,148,681,3207,15307,73822,358559,1751143, 8587649,42250473,208397918,1030017125,5099350476, 25279913728,125465667926,623278510259, 3098721059515,15416066743763,76738380083743, 382176833557163,1904142981324656,9490603393188092, 47318029786249952,235982999815553655] |