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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 53 |
| 3 | 531 |
| 4 | 5628 |
| 5 | 61548 |
| 6 | 686630 |
| 7 | 7766396 |
| 8 | 88737998 |
| 9 | 1021790013 |
| 10 | 11837767158 |
| 11 | 137825528185 |
| 12 | 1611269752236 |
| 13 | 18901744731931 |
| 14 | 222387215999071 |
| 15 | 2623111989210510 |
| 16 | 31008557957020701 |
| 17 | 367272410007660652 |
| 18 | 4357537180835561768 |
| 19 | 51779701659010388535 |
| 20 | 616134542980865344208 |
[1,6,53,531,5628,61548,686630,7766396,88737998, 1021790013,11837767158,137825528185,1611269752236, 18901744731931,222387215999071,2623111989210510, 31008557957020701,367272410007660652, 4357537180835561768,51779701659010388535, 616134542980865344208] |