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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 22 |
| 5 | 62 |
| 6 | 215 |
| 7 | 708 |
| 8 | 2509 |
| 9 | 8925 |
| 10 | 32078 |
| 11 | 118661 |
| 12 | 440178 |
| 13 | 1657992 |
| 14 | 6278939 |
| 15 | 24033464 |
| 16 | 92682133 |
| 17 | 358921659 |
| 18 | 1400617687 |
| 19 | 5489703720 |
| 20 | 21631282920 |
| 21 | 85549496243 |
| 22 | 339806449140 |
| 23 | 1354961614440 |
| 24 | 5419329749825 |
| 25 | 21747200755159 |
| 26 | 87523233075117 |
| 27 | 353243743565773 |
| 28 | 1429174212609720 |
| 29 | 5796355553493317 |
[1,1,3,6,22,62,215,708,2509,8925,32078,118661, 440178,1657992,6278939,24033464,92682133, 358921659,1400617687,5489703720,21631282920, 85549496243,339806449140,1354961614440, 5419329749825,21747200755159,87523233075117, 353243743565773,1429174212609720,5796355553493317] |