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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 17 |
| 5 | 49 |
| 6 | 175 |
| 7 | 574 |
| 8 | 2215 |
| 9 | 7794 |
| 10 | 31002 |
| 11 | 114827 |
| 12 | 469571 |
| 13 | 1802223 |
| 14 | 7507304 |
| 15 | 29616634 |
| 16 | 125224110 |
| 17 | 504660980 |
| 18 | 2158999665 |
| 19 | 8852141829 |
| 20 | 38237746911 |
| 21 | 159011512866 |
| 22 | 692421182858 |
| 23 | 2913714414087 |
| 24 | 12774870975808 |
| 25 | 54299529666488 |
| 26 | 239474510946361 |
| 27 | 1026713175859252 |
| 28 | 4551287121301993 |
[1,1,2,5,17,49,175,574,2215,7794,31002,114827, 469571,1802223,7507304,29616634,125224110, 504660980,2158999665,8852141829,38237746911, 159011512866,692421182858,2913714414087, 12774870975808,54299529666488,239474510946361, 1026713175859252,4551287121301993] |