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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 4 |
| 3 | 5 |
| 4 | 9 |
| 5 | 12 |
| 6 | 23 |
| 7 | 31 |
| 8 | 60 |
| 9 | 81 |
| 10 | 157 |
| 11 | 212 |
| 12 | 411 |
| 13 | 555 |
| 14 | 1076 |
| 15 | 1453 |
| 16 | 2817 |
| 17 | 3804 |
| 18 | 7375 |
| 19 | 9959 |
| 20 | 19308 |
| 21 | 26073 |
| 22 | 50549 |
| 23 | 68260 |
| 24 | 132339 |
| 25 | 178707 |
| 26 | 346468 |
| 27 | 467861 |
| 28 | 907065 |
| 29 | 1224876 |
| 30 | 2374727 |
| 31 | 3206767 |
| 32 | 6217116 |
| 33 | 8395425 |
| 34 | 16276621 |
| 35 | 21979508 |
| 36 | 42612747 |
| 37 | 57543099 |
| 38 | 111561620 |
[3,4,5,9,12,23,31,60,81,157,212,411,555,1076,1453, 2817,3804,7375,9959,19308,26073,50549,68260, 132339,178707,346468,467861,907065,1224876, 2374727,3206767,6217116,8395425,16276621,21979508, 42612747,57543099,111561620] |