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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 10 |
| 3 | 38 |
| 4 | 156 |
| 5 | 534 |
| 6 | 2014 |
| 7 | 6796 |
| 8 | 23312 |
| 9 | 76165 |
| 10 | 247234 |
| 11 | 780343 |
| 12 | 2435903 |
| 13 | 7453859 |
| 14 | 22538336 |
| 15 | 67130594 |
| 16 | 197666509 |
| 17 | 574876417 |
| 18 | 1654464954 |
| 19 | 4711217687 |
| 20 | 13288453688 |
| 21 | 37133349758 |
| 22 | 102873771662 |
| 23 | 282630567325 |
| 24 | 770410193747 |
| 25 | 2084205092693 |
| 26 | 5598070811010 |
[1,1,10,38,156,534,2014,6796,23312,76165,247234, 780343,2435903,7453859,22538336,67130594, 197666509,574876417,1654464954,4711217687, 13288453688,37133349758,102873771662,282630567325, 770410193747,2084205092693,5598070811010] |