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A274804 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 14 |
| 4 | 69 |
| 5 | 367 |
| 6 | 2284 |
| 7 | 15430 |
| 8 | 115146 |
| 9 | 924555 |
| 10 | 7991892 |
| 11 | 73547322 |
| 12 | 718621516 |
| 13 | 7410375897 |
| 14 | 80405501540 |
| 15 | 914492881330 |
| 16 | 10873902417225 |
| 17 | 134808633318271 |
| 18 | 1738734267608613 |
| 19 | 23282225008741565 |
| 20 | 323082222240744379 |
| 21 | 4638440974576329923 |
| 22 | 68794595993688306903 |
[1,1,4,14,69,367,2284,15430,115146,924555,7991892, 73547322,718621516,7410375897,80405501540, 914492881330,10873902417225,134808633318271, 1738734267608613,23282225008741565, 323082222240744379,4638440974576329923, 68794595993688306903] |