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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 28 |
| 4 | 118 |
| 5 | 531 |
| 6 | 2468 |
| 7 | 11803 |
| 8 | 57684 |
| 9 | 286757 |
| 10 | 1446170 |
| 11 | 7379881 |
| 12 | 38043130 |
| 13 | 197822526 |
| 14 | 1036473665 |
| 15 | 5466733758 |
| 16 | 29003678329 |
| 17 | 154689197699 |
| 18 | 828926263122 |
| 19 | 4460905720669 |
| 20 | 24099684585681 |
| 21 | 130657255240514 |
| 22 | 710658902564016 |
| 23 | 3876874286092771 |
| 24 | 21207804910818281 |
| 25 | 116309469589961213 |
| 26 | 639383247986188829 |
[1,2,7,28,118,531,2468,11803,57684,286757,1446170, 7379881,38043130,197822526,1036473665,5466733758, 29003678329,154689197699,828926263122, 4460905720669,24099684585681,130657255240514, 710658902564016,3876874286092771, 21207804910818281,116309469589961213, 639383247986188829] |