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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 23 |
| 4 | 94 |
| 5 | 357 |
| 6 | 1519 |
| 7 | 6195 |
| 8 | 26950 |
| 9 | 114187 |
| 10 | 504639 |
| 11 | 2190082 |
| 12 | 9791313 |
| 13 | 43205127 |
| 14 | 194850625 |
| 15 | 870315396 |
| 16 | 3951836163 |
| 17 | 17815087768 |
| 18 | 81338785555 |
| 19 | 369345445042 |
| 20 | 1694024296573 |
| 21 | 7737230531213 |
| 22 | 35623621507846 |
| 23 | 163487185465527 |
| 24 | 755195334127306 |
| 25 | 3479713518316390 |
| 26 | 16119455188080469 |
| 27 | 74526182714110913 |
[1,2,7,23,94,357,1519,6195,26950,114187,504639, 2190082,9791313,43205127,194850625,870315396, 3951836163,17815087768,81338785555,369345445042, 1694024296573,7737230531213,35623621507846, 163487185465527,755195334127306,3479713518316390, 16119455188080469,74526182714110913] |