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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 4 |
| 3 | 8 |
| 4 | 16 |
| 5 | 28 |
| 6 | 50 |
| 7 | 88 |
| 8 | 156 |
| 9 | 278 |
| 10 | 496 |
| 11 | 886 |
| 12 | 1582 |
| 13 | 2824 |
| 14 | 5040 |
| 15 | 8994 |
| 16 | 16050 |
| 17 | 28642 |
| 18 | 51114 |
| 19 | 91218 |
| 20 | 162788 |
| 21 | 290512 |
| 22 | 518448 |
| 23 | 925222 |
| 24 | 1651150 |
| 25 | 2946640 |
| 26 | 5258570 |
| 27 | 9384438 |
| 28 | 16747458 |
| 29 | 29887496 |
| 30 | 53337194 |
| 31 | 95185500 |
| 32 | 169867942 |
| 33 | 303146148 |
| 34 | 540994292 |
[2,4,8,16,28,50,88,156,278,496,886,1582,2824,5040, 8994,16050,28642,51114,91218,162788,290512,518448, 925222,1651150,2946640,5258570,9384438,16747458, 29887496,53337194,95185500,169867942,303146148, 540994292] |