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| n | a(n) |
|---|---|
| 0 | 2 |
| 1 | 18 |
| 2 | 20 |
| 3 | 38 |
| 4 | 58 |
| 5 | 96 |
| 6 | 154 |
| 7 | 250 |
| 8 | 404 |
| 9 | 654 |
| 10 | 1058 |
| 11 | 1712 |
| 12 | 2770 |
| 13 | 4482 |
| 14 | 7252 |
| 15 | 11734 |
| 16 | 18986 |
| 17 | 30720 |
| 18 | 49706 |
| 19 | 80426 |
| 20 | 130132 |
| 21 | 210558 |
| 22 | 340690 |
| 23 | 551248 |
| 24 | 891938 |
| 25 | 1443186 |
| 26 | 2335124 |
| 27 | 3778310 |
| 28 | 6113434 |
| 29 | 9891744 |
| 30 | 16005178 |
[2,18,20,38,58,96,154,250,404,654,1058,1712,2770, 4482,7252,11734,18986,30720,49706,80426,130132, 210558,340690,551248,891938,1443186,2335124, 3778310,6113434,9891744,16005178] |