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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 6 |
| 4 | 17 |
| 5 | 31 |
| 6 | 76 |
| 7 | 152 |
| 8 | 349 |
| 9 | 729 |
| 10 | 1624 |
| 11 | 3462 |
| 12 | 7605 |
| 13 | 16367 |
| 14 | 35720 |
| 15 | 77216 |
| 16 | 168009 |
| 17 | 363937 |
| 18 | 790748 |
| 19 | 1714550 |
| 20 | 3722857 |
| 21 | 8075759 |
| 22 | 17529780 |
| 23 | 38034200 |
| 24 | 82547781 |
| 25 | 179120601 |
| 26 | 388729744 |
| 27 | 843543766 |
| 28 | 1830612397 |
| 29 | 3972513951 |
| 30 | 8620807376 |
| 31 | 18707736832 |
| 32 | 40597645009 |
| 33 | 88100048129 |
[1,1,4,6,17,31,76,152,349,729,1624,3462,7605, 16367,35720,77216,168009,363937,790748,1714550, 3722857,8075759,17529780,38034200,82547781, 179120601,388729744,843543766,1830612397, 3972513951,8620807376,18707736832,40597645009, 88100048129] |