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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 11 |
| 4 | 32 |
| 5 | 84 |
| 6 | 230 |
| 7 | 597 |
| 8 | 1567 |
| 9 | 4020 |
| 10 | 10286 |
| 11 | 25994 |
| 12 | 65387 |
| 13 | 163065 |
| 14 | 404617 |
| 15 | 997687 |
| 16 | 2448220 |
| 17 | 5977334 |
| 18 | 14530835 |
| 19 | 35173496 |
| 20 | 84814982 |
| 21 | 203760809 |
| 22 | 487845377 |
| 23 | 1164191563 |
| 24 | 2769721073 |
| 25 | 6570218773 |
| 26 | 15542642042 |
| 27 | 36671354125 |
| 28 | 86306246887 |
| 29 | 202637312099 |
| 30 | 474684979292 |
| 31 | 1109539437382 |
[1,1,4,11,32,84,230,597,1567,4020,10286,25994, 65387,163065,404617,997687,2448220,5977334, 14530835,35173496,84814982,203760809,487845377, 1164191563,2769721073,6570218773,15542642042, 36671354125,86306246887,202637312099,474684979292, 1109539437382] |