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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 12 |
| 5 | 25 |
| 6 | 77 |
| 7 | 201 |
| 8 | 736 |
| 9 | 2009 |
| 10 | 7091 |
| 11 | 21545 |
| 12 | 78274 |
| 13 | 237897 |
| 14 | 903894 |
| 15 | 2872275 |
| 16 | 10734876 |
| 17 | 35317989 |
| 18 | 135653517 |
| 19 | 448156807 |
| 20 | 1740713832 |
| 21 | 5905699865 |
| 22 | 22903738044 |
| 23 | 78582846753 |
| 24 | 310297396582 |
| 25 | 1073392254315 |
| 26 | 4242820759859 |
| 27 | 14918080113383 |
| 28 | 59228120312530 |
| 29 | 209118568989577 |
| 30 | 838914634762489 |
| 31 | 2988126622770495 |
[1,1,2,3,12,25,77,201,736,2009,7091,21545,78274, 237897,903894,2872275,10734876,35317989,135653517, 448156807,1740713832,5905699865,22903738044, 78582846753,310297396582,1073392254315, 4242820759859,14918080113383,59228120312530, 209118568989577,838914634762489,2988126622770495] |