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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 20 |
| 5 | 129 |
| 6 | 1316 |
| 7 | 16813 |
| 8 | 262284 |
| 9 | 4783029 |
| 10 | 100002024 |
| 11 | 2357947701 |
| 12 | 61917406672 |
| 13 | 1792160394049 |
| 14 | 56693913450992 |
| 15 | 1946195068379933 |
| 16 | 72057594071484456 |
| 17 | 2862423051509815809 |
| 18 | 121439531097819321972 |
| 19 | 5480386857784802185957 |
| 20 | 262144000000051200072048 |
| 21 | 13248496640331026150086281 |
[1,2,5,20,129,1316,16813,262284,4783029,100002024, 2357947701,61917406672,1792160394049, 56693913450992,1946195068379933,72057594071484456, 2862423051509815809,121439531097819321972, 5480386857784802185957,262144000000051200072048, 13248496640331026150086281] |