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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 21 |
| 5 | 71 |
| 6 | 222 |
| 7 | 652 |
| 8 | 1838 |
| 9 | 5053 |
| 10 | 13682 |
| 11 | 36697 |
| 12 | 97814 |
| 13 | 259585 |
| 14 | 686709 |
| 15 | 1812257 |
| 16 | 4773804 |
| 17 | 12557136 |
| 18 | 32994311 |
| 19 | 86620279 |
| 20 | 227256969 |
| 21 | 595933506 |
| 22 | 1562111927 |
| 23 | 4093542416 |
| 24 | 10724799901 |
| 25 | 28093431826 |
| 26 | 73580651302 |
| 27 | 192698841652 |
[1,2,6,21,71,222,652,1838,5053,13682,36697,97814, 259585,686709,1812257,4773804,12557136,32994311, 86620279,227256969,595933506,1562111927, 4093542416,10724799901,28093431826,73580651302, 192698841652] |