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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 13 |
| 3 | 415 |
| 4 | 22321 |
| 5 | 1721101 |
| 6 | 174252997 |
| 7 | 21935478979 |
| 8 | 3308902366945 |
| 9 | 582483654850105 |
| 10 | 117302814498577501 |
| 11 | 26610247617703733479 |
| 12 | 6716634535536518884177 |
| 13 | 1867456548257171896034245 |
| 14 | 567177496490226897535216405 |
| 15 | 186852683125922747089699211851 |
| 16 | 66371163246016212237620717414593 |
| 17 | 25287323016605747194753141853886961 |
| 18 | 10287301449354981886046538248627595565 |
| 19 | 4450859089975905722184296672608494825775 |
| 20 | 2040775907870521098252331495354110194770801 |
[1,1,13,415,22321,1721101,174252997,21935478979, 3308902366945,582483654850105,117302814498577501, 26610247617703733479,6716634535536518884177, 1867456548257171896034245, 567177496490226897535216405, 186852683125922747089699211851, 66371163246016212237620717414593, 25287323016605747194753141853886961, 10287301449354981886046538248627595565, 4450859089975905722184296672608494825775, 2040775907870521098252331495354110194770801] |