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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 9 |
| 3 | 34 |
| 4 | 151 |
| 5 | 659 |
| 6 | 2999 |
| 7 | 13714 |
| 8 | 63799 |
| 9 | 298397 |
| 10 | 1408415 |
| 11 | 6678827 |
| 12 | 31841195 |
| 13 | 152374091 |
| 14 | 731802083 |
| 15 | 3524706626 |
| 16 | 17021524103 |
| 17 | 82383673241 |
| 18 | 399539775647 |
| 19 | 1941095088373 |
| 20 | 9445526397891 |
| 21 | 46028331970139 |
| 22 | 224587864915595 |
| 23 | 1097124938773915 |
| 24 | 5365254892362091 |
| 25 | 26263285466953979 |
| 26 | 128675997398671299 |
[1,2,9,34,151,659,2999,13714,63799,298397,1408415, 6678827,31841195,152374091,731802083,3524706626, 17021524103,82383673241,399539775647, 1941095088373,9445526397891,46028331970139, 224587864915595,1097124938773915,5365254892362091, 26263285466953979,128675997398671299] |