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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 3 |
| 2 | 8 |
| 3 | 29 |
| 4 | 130 |
| 5 | 697 |
| 6 | 4376 |
| 7 | 31607 |
| 8 | 258690 |
| 9 | 2368847 |
| 10 | 24011832 |
| 11 | 267025409 |
| 12 | 3233119106 |
| 13 | 42346123861 |
| 14 | 596617706344 |
| 15 | 8998126507307 |
| 16 | 144651872924162 |
| 17 | 2469279716419035 |
| 18 | 44609768252582312 |
| 19 | 850345380011532261 |
| 20 | 17056474009400181122 |
[2,3,8,29,130,697,4376,31607,258690,2368847, 24011832,267025409,3233119106,42346123861, 596617706344,8998126507307,144651872924162, 2469279716419035,44609768252582312, 850345380011532261,17056474009400181122] |