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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 17 |
| 5 | 56 |
| 6 | 199 |
| 7 | 890 |
| 8 | 4649 |
| 9 | 27817 |
| 10 | 195946 |
| 11 | 1684398 |
| 12 | 17397323 |
| 13 | 208799982 |
| 14 | 2932164012 |
| 15 | 49785808832 |
| 16 | 1022745137705 |
| 17 | 24671296028079 |
| 18 | 695270673553051 |
| 19 | 23526126768837873 |
| 20 | 965093874912658722 |
| 21 | 46827415587504280547 |
| 22 | 2655503102769481320544 |
| 23 | 179856174616910379655073 |
| 24 | 14761130793635395568878091 |
| 25 | 1439881917495260610082685956 |
| 26 | 164363140573098989525137162900 |
| 27 | 22322323085863965044351721067969 |
[1,1,7,17,56,199,890,4649,27817,195946,1684398, 17397323,208799982,2932164012,49785808832, 1022745137705,24671296028079,695270673553051, 23526126768837873,965093874912658722, 46827415587504280547,2655503102769481320544, 179856174616910379655073, 14761130793635395568878091, 1439881917495260610082685956, 164363140573098989525137162900, 22322323085863965044351721067969] |