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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 11 |
| 5 | 43 |
| 6 | 181 |
| 7 | 797 |
| 8 | 3623 |
| 9 | 16883 |
| 10 | 80211 |
| 11 | 387069 |
| 12 | 1891993 |
| 13 | 9348037 |
| 14 | 46611111 |
| 15 | 234246003 |
| 16 | 1185284981 |
| 17 | 6033612461 |
| 18 | 30877015405 |
| 19 | 158761428015 |
| 20 | 819773798543 |
| 21 | 4249143243487 |
| 22 | 22100975481441 |
| 23 | 115316005733921 |
| 24 | 603418314889419 |
[1,1,3,11,43,181,797,3623,16883,80211,387069, 1891993,9348037,46611111,234246003,1185284981, 6033612461,30877015405,158761428015,819773798543, 4249143243487,22100975481441,115316005733921, 603418314889419] |