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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 8 |
| 4 | 46 |
| 5 | 322 |
| 6 | 2564 |
| 7 | 22482 |
| 8 | 213358 |
| 9 | 2170856 |
| 10 | 23563266 |
| 11 | 272229894 |
| 12 | 3345403228 |
| 13 | 43736868406 |
| 14 | 608546129090 |
| 15 | 9012054592672 |
| 16 | 141977836757366 |
| 17 | 2376612322575818 |
| 18 | 42191783298374292 |
| 19 | 792519258202255050 |
| 20 | 15709695283993859430 |
| 21 | 327743321824492243272 |
| 22 | 7177487348025844367658 |
| 23 | 164595689482728908058190 |
| 24 | 3943617273778939651118764 |
| 25 | 98517855256524601996722238 |
| 26 | 2561403841975017528679295466 |
| 27 | 69192589389178960801205055872 |
[1,2,8,46,322,2564,22482,213358,2170856,23563266, 272229894,3345403228,43736868406,608546129090, 9012054592672,141977836757366,2376612322575818, 42191783298374292,792519258202255050, 15709695283993859430,327743321824492243272, 7177487348025844367658,164595689482728908058190, 3943617273778939651118764, 98517855256524601996722238, 2561403841975017528679295466, 69192589389178960801205055872] |