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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 37 |
| 4 | 143 |
| 5 | 585 |
| 6 | 2474 |
| 7 | 10676 |
| 8 | 46847 |
| 9 | 208584 |
| 10 | 940109 |
| 11 | 4278267 |
| 12 | 19615829 |
| 13 | 90525966 |
| 14 | 420246448 |
| 15 | 1960950448 |
| 16 | 9190034528 |
| 17 | 43231693467 |
| 18 | 204062350204 |
| 19 | 966205062996 |
| 20 | 4587557733718 |
| 21 | 21835695015254 |
| 22 | 104165428886620 |
| 23 | 497936775016721 |
| 24 | 2384782452148250 |
| 25 | 11441368406753390 |
| 26 | 54979295791255949 |
[1,3,10,37,143,585,2474,10676,46847,208584,940109, 4278267,19615829,90525966,420246448,1960950448, 9190034528,43231693467,204062350204,966205062996, 4587557733718,21835695015254,104165428886620, 497936775016721,2384782452148250, 11441368406753390,54979295791255949] |