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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 2 |
| 3 | 2 |
| 4 | 6 |
| 5 | 12 |
| 6 | 20 |
| 7 | 30 |
| 8 | 46 |
| 9 | 74 |
| 10 | 122 |
| 11 | 200 |
| 12 | 324 |
| 13 | 522 |
| 14 | 842 |
| 15 | 1362 |
| 16 | 2206 |
| 17 | 3572 |
| 18 | 5780 |
| 19 | 9350 |
| 20 | 15126 |
| 21 | 24474 |
| 22 | 39602 |
| 23 | 64080 |
| 24 | 103684 |
| 25 | 167762 |
| 26 | 271442 |
| 27 | 439202 |
| 28 | 710646 |
| 29 | 1149852 |
| 30 | 1860500 |
| 31 | 3010350 |
| 32 | 4870846 |
| 33 | 7881194 |
| 34 | 12752042 |
| 35 | 20633240 |
| 36 | 33385284 |
| 37 | 54018522 |
| 38 | 87403802 |
| 39 | 141422322 |
[2,2,2,6,12,20,30,46,74,122,200,324,522,842,1362, 2206,3572,5780,9350,15126,24474,39602,64080, 103684,167762,271442,439202,710646,1149852, 1860500,3010350,4870846,7881194,12752042,20633240, 33385284,54018522,87403802,141422322] |