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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 33 |
| 4 | 150 |
| 5 | 684 |
| 6 | 3229 |
| 7 | 15298 |
| 8 | 73626 |
| 9 | 355375 |
| 10 | 1729522 |
| 11 | 8436439 |
| 12 | 41348599 |
| 13 | 203019209 |
| 14 | 999765220 |
| 15 | 4930173250 |
| 16 | 24359727084 |
| 17 | 120490798599 |
| 18 | 596787779737 |
| 19 | 2958395511129 |
| 20 | 14679546022648 |
| 21 | 72889010886540 |
| 22 | 362178959182390 |
| 23 | 1800603552325418 |
| 24 | 8956750649823073 |
| 25 | 44572886772095708 |
| 26 | 221909515125736005 |
[1,2,8,33,150,684,3229,15298,73626,355375,1729522, 8436439,41348599,203019209,999765220,4930173250, 24359727084,120490798599,596787779737, 2958395511129,14679546022648,72889010886540, 362178959182390,1800603552325418,8956750649823073, 44572886772095708,221909515125736005] |