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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 13 |
| 3 | 80 |
| 4 | 385 |
| 5 | 2345 |
| 6 | 14329 |
| 7 | 88264 |
| 8 | 538417 |
| 9 | 3284212 |
| 10 | 20034334 |
| 11 | 122324128 |
| 12 | 746763789 |
| 13 | 4557854384 |
| 14 | 27820780958 |
| 15 | 169811407936 |
| 16 | 1036520322168 |
| 17 | 6326740063001 |
| 18 | 38617694163183 |
| 19 | 235716525841304 |
| 20 | 1438783215929873 |
[1,13,80,385,2345,14329,88264,538417,3284212, 20034334,122324128,746763789,4557854384, 27820780958,169811407936,1036520322168, 6326740063001,38617694163183,235716525841304, 1438783215929873] |