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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 19 |
| 3 | 65 |
| 4 | 210 |
| 5 | 654 |
| 6 | 1985 |
| 7 | 5911 |
| 8 | 17345 |
| 9 | 50305 |
| 10 | 144516 |
| 11 | 411900 |
| 12 | 1166209 |
| 13 | 3283145 |
| 14 | 9197455 |
| 15 | 25655489 |
| 16 | 71293590 |
| 17 | 197452746 |
| 18 | 545222465 |
| 19 | 1501460635 |
| 20 | 4124739581 |
| 21 | 11306252545 |
| 22 | 30928921224 |
| 23 | 84451726200 |
| 24 | 230204999425 |
[1,5,19,65,210,654,1985,5911,17345,50305,144516, 411900,1166209,3283145,9197455,25655489,71293590, 197452746,545222465,1501460635,4124739581, 11306252545,30928921224,84451726200,230204999425] |