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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 13 |
| 4 | 49 |
| 5 | 177 |
| 6 | 667 |
| 7 | 2511 |
| 8 | 10009 |
| 9 | 39187 |
| 10 | 155965 |
| 11 | 634409 |
| 12 | 2572311 |
| 13 | 10467813 |
| 14 | 43375789 |
| 15 | 178967139 |
| 16 | 740636461 |
| 17 | 3103154817 |
| 18 | 12965474087 |
| 19 | 54264996479 |
| 20 | 229254996155 |
| 21 | 966417702403 |
| 22 | 4079049705641 |
| 23 | 17340341569785 |
| 24 | 73594562906139 |
| 25 | 312632789194025 |
| 26 | 1335568546118335 |
| 27 | 5698403070572647 |
[1,1,5,13,49,177,667,2511,10009,39187,155965, 634409,2572311,10467813,43375789,178967139, 740636461,3103154817,12965474087,54264996479, 229254996155,966417702403,4079049705641, 17340341569785,73594562906139,312632789194025, 1335568546118335,5698403070572647] |