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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 11 |
| 4 | 48 |
| 5 | 157 |
| 6 | 711 |
| 7 | 2559 |
| 8 | 11846 |
| 9 | 45183 |
| 10 | 212143 |
| 11 | 840277 |
| 12 | 3984616 |
| 13 | 16205687 |
| 14 | 77410374 |
| 15 | 321065635 |
| 16 | 1542228908 |
| 17 | 6494244945 |
| 18 | 31332380867 |
| 19 | 133546094665 |
| 20 | 646603376846 |
| 21 | 2783426236771 |
| 22 | 13516256002852 |
| 23 | 58666741189805 |
| 24 | 285582656349044 |
| 25 | 1248296193322585 |
| 26 | 6089197321956135 |
| 27 | 26777517944746803 |
[1,1,4,11,48,157,711,2559,11846,45183,212143, 840277,3984616,16205687,77410374,321065635, 1542228908,6494244945,31332380867,133546094665, 646603376846,2783426236771,13516256002852, 58666741189805,285582656349044,1248296193322585, 6089197321956135,26777517944746803] |