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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 14 |
| 4 | 31 |
| 5 | 223 |
| 6 | 494 |
| 7 | 3554 |
| 8 | 7873 |
| 9 | 56641 |
| 10 | 125474 |
| 11 | 902702 |
| 12 | 1999711 |
| 13 | 14386591 |
| 14 | 31869902 |
| 15 | 229282754 |
| 16 | 507918721 |
| 17 | 3654137473 |
| 18 | 8094829634 |
| 19 | 58236916814 |
| 20 | 129009355423 |
| 21 | 928136531551 |
| 22 | 2056054857134 |
| 23 | 14791947588002 |
| 24 | 32767868358721 |
[1,2,14,31,223,494,3554,7873,56641,125474,902702, 1999711,14386591,31869902,229282754,507918721, 3654137473,8094829634,58236916814,129009355423, 928136531551,2056054857134,14791947588002, 32767868358721] |