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| n | a(n) |
|---|---|
| 1 | 27 |
| 2 | 121 |
| 3 | 852 |
| 4 | 6443 |
| 5 | 52680 |
| 6 | 429976 |
| 7 | 3466702 |
| 8 | 27787183 |
| 9 | 222389326 |
| 10 | 1780673721 |
| 11 | 14267000759 |
| 12 | 114336941196 |
| 13 | 916296529103 |
| 14 | 7342802491841 |
| 15 | 58840508065211 |
| 16 | 471508681192630 |
| 17 | 3778370050644605 |
| 18 | 30277527214482376 |
| 19 | 242625604992194944 |
[27,121,852,6443,52680,429976,3466702,27787183, 222389326,1780673721,14267000759,114336941196, 916296529103,7342802491841,58840508065211, 471508681192630,3778370050644605, 30277527214482376,242625604992194944] |