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| n | a(n) |
|---|---|
| 1 | 2606 |
| 2 | 8142 |
| 3 | 25962 |
| 4 | 81390 |
| 5 | 242076 |
| 6 | 665256 |
| 7 | 1954106 |
| 8 | 5903724 |
| 9 | 17914000 |
| 10 | 54038937 |
| 11 | 160308249 |
| 12 | 478607126 |
| 13 | 1443443997 |
| 14 | 4369141817 |
| 15 | 13219429435 |
| 16 | 39902004658 |
| 17 | 120477837636 |
| 18 | 364791774779 |
| 19 | 1106851765150 |
| 20 | 3359640314837 |
| 21 | 10196138352130 |
[2606,8142,25962,81390,242076,665256,1954106, 5903724,17914000,54038937,160308249,478607126, 1443443997,4369141817,13219429435,39902004658, 120477837636,364791774779,1106851765150, 3359640314837,10196138352130] |