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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 51 |
| 3 | 506 |
| 4 | 5351 |
| 5 | 58481 |
| 6 | 652256 |
| 7 | 7376776 |
| 8 | 84281461 |
| 9 | 970444596 |
| 10 | 11242722766 |
| 11 | 130896288616 |
| 12 | 1530255133591 |
| 13 | 17951328648871 |
| 14 | 211205085558031 |
| 15 | 2491217772274111 |
| 16 | 29449438902782636 |
| 17 | 348806466779875961 |
| 18 | 4138454609488474736 |
| 19 | 49176494325141603881 |
[1,6,51,506,5351,58481,652256,7376776,84281461, 970444596,11242722766,130896288616,1530255133591, 17951328648871,211205085558031,2491217772274111, 29449438902782636,348806466779875961, 4138454609488474736,49176494325141603881] |