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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 37 |
| 4 | 326 |
| 5 | 3802 |
| 6 | 54992 |
| 7 | 948645 |
| 8 | 18992710 |
| 9 | 432655358 |
| 10 | 11046221254 |
| 11 | 312347907386 |
| 12 | 9688154906657 |
| 13 | 327018557066164 |
| 14 | 11932588574197763 |
| 15 | 468012768020438830 |
| 16 | 19634066192684343922 |
| 17 | 877272066059957914873 |
| 18 | 41590621075366029857195 |
| 19 | 2085184183314142201403129 |
[2,6,37,326,3802,54992,948645,18992710,432655358, 11046221254,312347907386,9688154906657, 327018557066164,11932588574197763, 468012768020438830,19634066192684343922, 877272066059957914873,41590621075366029857195, 2085184183314142201403129] |