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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 4 |
| 3 | 5 |
| 4 | 8 |
| 5 | 12 |
| 6 | 21 |
| 7 | 36 |
| 8 | 64 |
| 9 | 113 |
| 10 | 204 |
| 11 | 372 |
| 12 | 682 |
| 13 | 1260 |
| 14 | 2340 |
| 15 | 4369 |
| 16 | 8192 |
| 17 | 15420 |
| 18 | 29127 |
| 19 | 55188 |
| 20 | 104857 |
| 21 | 199728 |
| 22 | 381300 |
| 23 | 729444 |
| 24 | 1398101 |
| 25 | 2684354 |
| 26 | 5162220 |
| 27 | 9942053 |
| 28 | 19173961 |
| 29 | 37025580 |
| 30 | 71582788 |
| 31 | 138547332 |
| 32 | 268435456 |
| 33 | 520602096 |
| 34 | 1010580540 |
| 35 | 1963413621 |
| 36 | 3817748707 |
| 37 | 7429132620 |
| 38 | 14467258260 |
| 39 | 28192605840 |
| 40 | 54975581388 |
[4,4,5,8,12,21,36,64,113,204,372,682,1260,2340, 4369,8192,15420,29127,55188,104857,199728,381300, 729444,1398101,2684354,5162220,9942053,19173961, 37025580,71582788,138547332,268435456,520602096, 1010580540,1963413621,3817748707,7429132620, 14467258260,28192605840,54975581388] |