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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 25 |
| 5 | 87 |
| 6 | 307 |
| 7 | 1113 |
| 8 | 4149 |
| 9 | 15605 |
| 10 | 59201 |
| 11 | 225999 |
| 12 | 866449 |
| 13 | 3333847 |
| 14 | 12865335 |
| 15 | 49769689 |
| 16 | 192945411 |
| 17 | 749396493 |
| 18 | 2915432049 |
| 19 | 11358771965 |
| 20 | 44313108627 |
| 21 | 173081422997 |
| 22 | 676766482917 |
| 23 | 2648843996031 |
| 24 | 10376891445525 |
| 25 | 40685535827325 |
| 26 | 159641884780749 |
| 27 | 626849029013919 |
| 28 | 2463010645910537 |
| 29 | 9683604464279235 |
[1,1,3,9,25,87,307,1113,4149,15605,59201,225999, 866449,3333847,12865335,49769689,192945411, 749396493,2915432049,11358771965,44313108627, 173081422997,676766482917,2648843996031, 10376891445525,40685535827325,159641884780749, 626849029013919,2463010645910537,9683604464279235] |