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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 36 |
| 4 | 134 |
| 5 | 507 |
| 6 | 1937 |
| 7 | 7449 |
| 8 | 28783 |
| 9 | 111623 |
| 10 | 434130 |
| 11 | 1692387 |
| 12 | 6610292 |
| 13 | 25861384 |
| 14 | 101319095 |
| 15 | 397428091 |
| 16 | 1560588454 |
| 17 | 6133768656 |
| 18 | 24128550045 |
| 19 | 94986663925 |
| 20 | 374188128311 |
| 21 | 1474980414870 |
| 22 | 5817387549611 |
| 23 | 22955930045826 |
| 24 | 90629404431826 |
| 25 | 357960414264163 |
[1,3,10,36,134,507,1937,7449,28783,111623,434130, 1692387,6610292,25861384,101319095,397428091, 1560588454,6133768656,24128550045,94986663925, 374188128311,1474980414870,5817387549611, 22955930045826,90629404431826,357960414264163] |