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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 14 |
| 4 | 48 |
| 5 | 161 |
| 6 | 535 |
| 7 | 1759 |
| 8 | 5742 |
| 9 | 18619 |
| 10 | 60030 |
| 11 | 192526 |
| 12 | 614537 |
| 13 | 1953064 |
| 14 | 6182342 |
| 15 | 19497895 |
| 16 | 61282168 |
| 17 | 191995744 |
| 18 | 599721399 |
| 19 | 1868049926 |
| 20 | 5803381167 |
| 21 | 17984273654 |
| 22 | 55601057973 |
| 23 | 171516227866 |
| 24 | 527968915206 |
| 25 | 1621949729945 |
| 26 | 4973174537640 |
| 27 | 15220730405484 |
| 28 | 46502692854974 |
[1,1,4,14,48,161,535,1759,5742,18619,60030,192526, 614537,1953064,6182342,19497895,61282168, 191995744,599721399,1868049926,5803381167, 17984273654,55601057973,171516227866,527968915206, 1621949729945,4973174537640,15220730405484, 46502692854974] |