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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 8 |
| 3 | 35 |
| 4 | 154 |
| 5 | 756 |
| 6 | 3828 |
| 7 | 20163 |
| 8 | 108680 |
| 9 | 598026 |
| 10 | 3342404 |
| 11 | 18929092 |
| 12 | 108374252 |
| 13 | 626264700 |
| 14 | 3647936160 |
| 15 | 21396522915 |
| 16 | 126262239570 |
| 17 | 749087596620 |
| 18 | 4465444206300 |
| 19 | 26733390275130 |
| 20 | 160663411399920 |
| 21 | 968937572793060 |
| 22 | 5862111195487560 |
| 23 | 35569106862459300 |
| 24 | 216395609659221564 |
[1,3,8,35,154,756,3828,20163,108680,598026, 3342404,18929092,108374252,626264700,3647936160, 21396522915,126262239570,749087596620, 4465444206300,26733390275130,160663411399920, 968937572793060,5862111195487560, 35569106862459300,216395609659221564] |