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A186770 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 6 |
| 4 | 19 |
| 5 | 95 |
| 6 | 451 |
| 7 | 3157 |
| 8 | 21092 |
| 9 | 189828 |
| 10 | 1660351 |
| 11 | 18263861 |
| 12 | 197541565 |
| 13 | 2568040345 |
| 14 | 33029787974 |
| 15 | 495446819610 |
| 16 | 7377279473779 |
| 17 | 125413751054243 |
| 18 | 2120559951767503 |
| 19 | 40290639083582557 |
| 20 | 762353357154540584 |
| 21 | 16009420500245352264 |
[1,1,2,6,19,95,451,3157,21092,189828,1660351, 18263861,197541565,2568040345,33029787974, 495446819610,7377279473779,125413751054243, 2120559951767503,40290639083582557, 762353357154540584,16009420500245352264] |