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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 6 |
| 7 | 37 |
| 8 | 178 |
| 9 | 852 |
| 10 | 3767 |
| 11 | 16576 |
| 12 | 70635 |
| 13 | 300433 |
| 14 | 1260163 |
| 15 | 5287178 |
| 16 | 22058377 |
| 17 | 92181691 |
| 18 | 384663989 |
| 19 | 1609206870 |
| 20 | 6737170404 |
| 21 | 28291573975 |
| 22 | 119043337521 |
| 23 | 502559706310 |
| 24 | 2127305239457 |
| 25 | 9035671605064 |
| 26 | 38494638887783 |
| 27 | 164564824326835 |
| 28 | 705742561369640 |
| 29 | 3036895648331815 |
[1,6,37,178,852,3767,16576,70635,300433,1260163, 5287178,22058377,92181691,384663989,1609206870, 6737170404,28291573975,119043337521,502559706310, 2127305239457,9035671605064,38494638887783, 164564824326835,705742561369640,3036895648331815] |