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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 13 |
| 4 | 40 |
| 5 | 177 |
| 6 | 959 |
| 7 | 4927 |
| 8 | 28118 |
| 9 | 173747 |
| 10 | 1116769 |
| 11 | 7572422 |
| 12 | 53958439 |
| 13 | 400843780 |
| 14 | 3100289406 |
| 15 | 24912295541 |
| 16 | 207402869744 |
| 17 | 1785581874833 |
| 18 | 15870223469439 |
| 19 | 145385654206288 |
| 20 | 1370808547372554 |
| 21 | 13286036772531961 |
| 22 | 132211223720926353 |
| 23 | 1349366082883824538 |
| 24 | 14110857413371538549 |
| 25 | 151058713428413686374 |
| 26 | 1654028328360981132108 |
[1,1,2,13,40,177,959,4927,28118,173747,1116769, 7572422,53958439,400843780,3100289406,24912295541, 207402869744,1785581874833,15870223469439, 145385654206288,1370808547372554, 13286036772531961,132211223720926353, 1349366082883824538,14110857413371538549, 151058713428413686374,1654028328360981132108] |