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| n | a(n) |
|---|---|
| 2 | 1 |
| 3 | 7 |
| 4 | 34 |
| 5 | 173 |
| 6 | 741 |
| 7 | 3549 |
| 8 | 14670 |
| 9 | 68683 |
| 10 | 279715 |
| 11 | 1294598 |
| 12 | 5233060 |
| 13 | 24052965 |
| 14 | 96822587 |
| 15 | 442972139 |
| 16 | 1778697948 |
| 17 | 8110611295 |
| 18 | 32516501991 |
| 19 | 147897243768 |
| 20 | 592346459071 |
| 21 | 2688895275974 |
| 22 | 10762289869782 |
| 23 | 48776681304283 |
| 24 | 195143578562778 |
| 25 | 883272843800993 |
| 26 | 3532739195660162 |
[1,7,34,173,741,3549,14670,68683,279715,1294598, 5233060,24052965,96822587,442972139,1778697948, 8110611295,32516501991,147897243768,592346459071, 2688895275974,10762289869782,48776681304283, 195143578562778,883272843800993,3532739195660162] |