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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 28 |
| 4 | 273 |
| 5 | 3126 |
| 6 | 47450 |
| 7 | 823544 |
| 8 | 16843009 |
| 9 | 387440173 |
| 10 | 10009766650 |
| 11 | 285311670612 |
| 12 | 8918294543346 |
| 13 | 302875106592254 |
| 14 | 11112685048647250 |
| 15 | 437893920912786408 |
| 16 | 18447025552981295105 |
| 17 | 827240261886336764178 |
| 18 | 39346558271492178925595 |
| 19 | 1978419655660313589123980 |
[1,5,28,273,3126,47450,823544,16843009,387440173, 10009766650,285311670612,8918294543346, 302875106592254,11112685048647250, 437893920912786408,18447025552981295105, 827240261886336764178,39346558271492178925595, 1978419655660313589123980] |