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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 4 |
| 3 | 7 |
| 4 | 18 |
| 5 | 29 |
| 6 | 47 |
| 7 | 76 |
| 8 | 199 |
| 9 | 843 |
| 10 | 5778 |
| 11 | 9349 |
| 12 | 24476 |
| 13 | 64079 |
| 14 | 167761 |
| 15 | 1860498 |
| 16 | 4870847 |
| 17 | 7881196 |
| 18 | 599074578 |
| 19 | 1568397607 |
| 20 | 6643838879 |
| 21 | 817138163596 |
| 22 | 2139295485799 |
| 23 | 14662949395604 |
| 24 | 38388099893011 |
| 25 | 688846502588399 |
| 26 | 7639424778862807 |
| 27 | 12360848946698171 |
[3,4,7,18,29,47,76,199,843,5778,9349,24476,64079, 167761,1860498,4870847,7881196,599074578, 1568397607,6643838879,817138163596,2139295485799, 14662949395604,38388099893011,688846502588399, 7639424778862807,12360848946698171] |