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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 14 |
| 4 | 51 |
| 5 | 125 |
| 6 | 429 |
| 7 | 1039 |
| 8 | 3258 |
| 9 | 8254 |
| 10 | 23554 |
| 11 | 58934 |
| 12 | 168803 |
| 13 | 412177 |
| 14 | 1114550 |
| 15 | 2795446 |
| 16 | 7345875 |
| 17 | 18035424 |
| 18 | 46875324 |
| 19 | 114272057 |
| 20 | 291692396 |
| 21 | 709742614 |
| 22 | 1774402071 |
| 23 | 4290848175 |
| 24 | 10672950659 |
| 25 | 25572179792 |
| 26 | 62670553073 |
| 27 | 149978278320 |
[1,5,14,51,125,429,1039,3258,8254,23554,58934, 168803,412177,1114550,2795446,7345875,18035424, 46875324,114272057,291692396,709742614,1774402071, 4290848175,10672950659,25572179792,62670553073, 149978278320] |