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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 16 |
| 5 | 50 |
| 6 | 172 |
| 7 | 584 |
| 8 | 2099 |
| 9 | 7511 |
| 10 | 27744 |
| 11 | 102149 |
| 12 | 383428 |
| 13 | 1437628 |
| 14 | 5459131 |
| 15 | 20725518 |
| 16 | 79351092 |
| 17 | 303885651 |
| 18 | 1170633340 |
| 19 | 4512011156 |
| 20 | 17464075298 |
| 21 | 67640759405 |
| 22 | 262790111030 |
| 23 | 1021681702426 |
| 24 | 3981338129906 |
| 25 | 15525533476502 |
| 26 | 60650970703503 |
| 27 | 237093325059340 |
| 28 | 928129343959028 |
| 29 | 3635545755997639 |
[1,1,2,5,16,50,172,584,2099,7511,27744,102149, 383428,1437628,5459131,20725518,79351092, 303885651,1170633340,4512011156,17464075298, 67640759405,262790111030,1021681702426, 3981338129906,15525533476502,60650970703503, 237093325059340,928129343959028,3635545755997639] |