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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 12 |
| 3 | 35 |
| 4 | 77 |
| 5 | 154 |
| 6 | 287 |
| 7 | 513 |
| 8 | 890 |
| 9 | 1513 |
| 10 | 2546 |
| 11 | 4241 |
| 12 | 6997 |
| 13 | 11478 |
| 14 | 18747 |
| 15 | 30531 |
| 16 | 49620 |
| 17 | 80531 |
| 18 | 130571 |
| 19 | 211564 |
| 20 | 342641 |
| 21 | 554757 |
| 22 | 897998 |
| 23 | 1453405 |
| 24 | 2352105 |
| 25 | 3806266 |
| 26 | 6159183 |
| 27 | 9966319 |
| 28 | 16126432 |
| 29 | 26093743 |
| 30 | 42221231 |
[1,3,12,35,77,154,287,513,890,1513,2546,4241,6997, 11478,18747,30531,49620,80531,130571,211564, 342641,554757,897998,1453405,2352105,3806266, 6159183,9966319,16126432,26093743,42221231] |