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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 57 |
| 3 | 652 |
| 4 | 8250 |
| 5 | 111228 |
| 6 | 1566384 |
| 7 | 22770990 |
| 8 | 339136149 |
| 9 | 5147965790 |
| 10 | 79355002155 |
| 11 | 1238845925070 |
| 12 | 19546811164017 |
| 13 | 311215082863152 |
| 14 | 4993737492276384 |
| 15 | 80673666233512572 |
| 16 | 1311052196736963738 |
| 17 | 21418709030787603984 |
| 18 | 351563022864652061086 |
| 19 | 5794815410347964694408 |
[1,6,57,652,8250,111228,1566384,22770990, 339136149,5147965790,79355002155,1238845925070, 19546811164017,311215082863152,4993737492276384, 80673666233512572,1311052196736963738, 21418709030787603984,351563022864652061086, 5794815410347964694408] |