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A369727 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 15 |
| 4 | 226 |
| 5 | 2630 |
| 6 | 95420 |
| 7 | 4177117 |
| 8 | 371458250 |
| 9 | 49558386762 |
| 10 | 11496848193144 |
| 11 | 4055873729544890 |
| 12 | 2321900139799896688 |
| 13 | 2052844416093203835934 |
| 14 | 2864423943667784141723196 |
| 15 | 6181759121650271558049171285 |
| 16 | 20773297302068160010868731066114 |
[1,1,4,15,226,2630,95420,4177117,371458250, 49558386762,11496848193144,4055873729544890, 2321900139799896688,2052844416093203835934, 2864423943667784141723196, 6181759121650271558049171285, 20773297302068160010868731066114] |