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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 31 |
| 4 | 130 |
| 5 | 562 |
| 6 | 2499 |
| 7 | 11273 |
| 8 | 51570 |
| 9 | 238304 |
| 10 | 1110437 |
| 11 | 5208089 |
| 12 | 24564106 |
| 13 | 116407697 |
| 14 | 553867430 |
| 15 | 2644404622 |
| 16 | 12664014094 |
| 17 | 60810286265 |
| 18 | 292688347154 |
| 19 | 1411714148172 |
| 20 | 6821984083290 |
| 21 | 33022890818164 |
| 22 | 160098963249772 |
| 23 | 777270043548144 |
| 24 | 3778448507940336 |
| 25 | 18389339288284741 |
| 26 | 89596016762035139 |
[1,2,8,31,130,562,2499,11273,51570,238304,1110437, 5208089,24564106,116407697,553867430,2644404622, 12664014094,60810286265,292688347154, 1411714148172,6821984083290,33022890818164, 160098963249772,777270043548144,3778448507940336, 18389339288284741,89596016762035139] |