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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 13 |
| 4 | 44 |
| 5 | 150 |
| 6 | 548 |
| 7 | 1979 |
| 8 | 7324 |
| 9 | 27074 |
| 10 | 101620 |
| 11 | 381338 |
| 12 | 1444860 |
| 13 | 5478476 |
| 14 | 20902380 |
| 15 | 79824913 |
| 16 | 306175148 |
| 17 | 1175699494 |
| 18 | 4528970884 |
| 19 | 17465198198 |
| 20 | 67512268620 |
| 21 | 261240684772 |
| 22 | 1012744843508 |
| 23 | 3929870352586 |
| 24 | 15272109227396 |
| 25 | 59401882159868 |
| 26 | 231326540050700 |
| 27 | 901564182638872 |
| 28 | 3517261162906916 |
[1,1,4,13,44,150,548,1979,7324,27074,101620, 381338,1444860,5478476,20902380,79824913, 306175148,1175699494,4528970884,17465198198, 67512268620,261240684772,1012744843508, 3929870352586,15272109227396,59401882159868, 231326540050700,901564182638872,3517261162906916] |