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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 29 |
| 4 | 122 |
| 5 | 513 |
| 6 | 2243 |
| 7 | 9945 |
| 8 | 44789 |
| 9 | 203815 |
| 10 | 936687 |
| 11 | 4332665 |
| 12 | 20183601 |
| 13 | 94464361 |
| 14 | 444300666 |
| 15 | 2097754746 |
| 16 | 9938925775 |
| 17 | 47239005352 |
| 18 | 225124194033 |
| 19 | 1075566614995 |
| 20 | 5150096298764 |
| 21 | 24709433243624 |
| 22 | 118774144300117 |
| 23 | 571873440724543 |
| 24 | 2757757069596343 |
| 25 | 13317667222219943 |
| 26 | 64397599612546547 |
[1,2,8,29,122,513,2243,9945,44789,203815,936687, 4332665,20183601,94464361,444300666,2097754746, 9938925775,47239005352,225124194033,1075566614995, 5150096298764,24709433243624,118774144300117, 571873440724543,2757757069596343, 13317667222219943,64397599612546547] |