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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 17 |
| 4 | 69 |
| 5 | 285 |
| 6 | 1233 |
| 7 | 5359 |
| 8 | 23959 |
| 9 | 107925 |
| 10 | 491337 |
| 11 | 2256035 |
| 12 | 10436057 |
| 13 | 48518807 |
| 14 | 226804345 |
| 15 | 1064891773 |
| 16 | 5018350417 |
| 17 | 23729155959 |
| 18 | 112551561343 |
| 19 | 535260211983 |
| 20 | 2551688206089 |
| 21 | 12191552706353 |
| 22 | 58365723069747 |
| 23 | 279927193571759 |
| 24 | 1344828850286155 |
| 25 | 6470867761444667 |
| 26 | 31180041296193907 |
| 27 | 150441587819334189 |
[1,1,5,17,69,285,1233,5359,23959,107925,491337, 2256035,10436057,48518807,226804345,1064891773, 5018350417,23729155959,112551561343,535260211983, 2551688206089,12191552706353,58365723069747, 279927193571759,1344828850286155,6470867761444667, 31180041296193907,150441587819334189] |