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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 23 |
| 4 | 111 |
| 5 | 562 |
| 6 | 2952 |
| 7 | 15948 |
| 8 | 88076 |
| 9 | 495077 |
| 10 | 2823293 |
| 11 | 16295020 |
| 12 | 95007654 |
| 13 | 558765743 |
| 14 | 3310999269 |
| 15 | 19748462718 |
| 16 | 118471172054 |
| 17 | 714355994997 |
| 18 | 4327148812557 |
| 19 | 26319195869861 |
| 20 | 160677354596769 |
| 21 | 984236344800234 |
| 22 | 6047526697800992 |
| 23 | 37262944840704171 |
[1,1,5,23,111,562,2952,15948,88076,495077,2823293, 16295020,95007654,558765743,3310999269, 19748462718,118471172054,714355994997, 4327148812557,26319195869861,160677354596769, 984236344800234,6047526697800992, 37262944840704171] |