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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 32 |
| 4 | 102 |
| 5 | 323 |
| 6 | 1021 |
| 7 | 3224 |
| 8 | 10177 |
| 9 | 32121 |
| 10 | 101378 |
| 11 | 319960 |
| 12 | 1009830 |
| 13 | 3187145 |
| 14 | 10059029 |
| 15 | 31747584 |
| 16 | 100199485 |
| 17 | 316242607 |
| 18 | 998102878 |
| 19 | 3150142840 |
| 20 | 9942261690 |
| 21 | 31379074783 |
| 22 | 99036453193 |
| 23 | 312571964808 |
| 24 | 986517893269 |
| 25 | 3113579153493 |
| 26 | 9826861945870 |
[1,3,10,32,102,323,1021,3224,10177,32121,101378, 319960,1009830,3187145,10059029,31747584, 100199485,316242607,998102878,3150142840, 9942261690,31379074783,99036453193,312571964808, 986517893269,3113579153493,9826861945870] |