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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 20 |
| 5 | 54 |
| 6 | 167 |
| 7 | 528 |
| 8 | 1672 |
| 9 | 5471 |
| 10 | 17981 |
| 11 | 60139 |
| 12 | 203024 |
| 13 | 687400 |
| 14 | 2361146 |
| 15 | 8129436 |
| 16 | 28138474 |
| 17 | 98079577 |
| 18 | 342877988 |
| 19 | 1203994543 |
| 20 | 4242357232 |
| 21 | 14998885029 |
| 22 | 53192103457 |
| 23 | 189077433312 |
| 24 | 674049702154 |
| 25 | 2408310185281 |
| 26 | 8621409878132 |
| 27 | 30930738955158 |
| 28 | 111168756778109 |
| 29 | 400226995774209 |
| 30 | 1443243712653720 |
[1,1,3,6,20,54,167,528,1672,5471,17981,60139, 203024,687400,2361146,8129436,28138474,98079577, 342877988,1203994543,4242357232,14998885029, 53192103457,189077433312,674049702154, 2408310185281,8621409878132,30930738955158, 111168756778109,400226995774209,1443243712653720] |