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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 23 |
| 3 | 136 |
| 4 | 897 |
| 5 | 6367 |
| 6 | 46706 |
| 7 | 355148 |
| 8 | 2770239 |
| 9 | 21984207 |
| 10 | 176966593 |
| 11 | 1440765209 |
| 12 | 11838096715 |
| 13 | 98014747908 |
| 14 | 816769206831 |
[4,23,136,897,6367,46706,355148,2770239,21984207, 176966593,1440765209,11838096715,98014747908, 816769206831] |