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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 27 |
| 4 | 236 |
| 5 | 2405 |
| 6 | 27322 |
| 7 | 341359 |
| 8 | 4714996 |
| 9 | 72864319 |
| 10 | 1265303986 |
| 11 | 24429044332 |
| 12 | 514629734620 |
| 13 | 11658131151120 |
| 14 | 282702829140564 |
| 15 | 7356326626391035 |
| 16 | 205875441726381570 |
| 17 | 6178380749014085048 |
| 18 | 197325821666554796930 |
| 19 | 6653680184371365887508 |
| 20 | 235653641615055767872038 |
| 21 | 8749040544777960685341423 |
[1,1,4,27,236,2405,27322,341359,4714996,72864319, 1265303986,24429044332,514629734620, 11658131151120,282702829140564,7356326626391035, 205875441726381570,6178380749014085048, 197325821666554796930,6653680184371365887508, 235653641615055767872038, 8749040544777960685341423] |