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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 7 |
| 4 | 16 |
| 5 | 39 |
| 6 | 86 |
| 7 | 189 |
| 8 | 402 |
| 9 | 847 |
| 10 | 1760 |
| 11 | 3631 |
| 12 | 7438 |
| 13 | 15165 |
| 14 | 30794 |
| 15 | 62343 |
| 16 | 125904 |
| 17 | 253783 |
| 18 | 510758 |
| 19 | 1026685 |
| 20 | 2061730 |
| 21 | 4136991 |
| 22 | 8295872 |
| 23 | 16627167 |
| 24 | 33311646 |
| 25 | 66716029 |
| 26 | 133582106 |
| 27 | 267406999 |
| 28 | 535206832 |
| 29 | 1071049287 |
| 30 | 2143127030 |
| 31 | 4287918141 |
| 32 | 8578528818 |
| 33 | 17161414255 |
[0,1,2,7,16,39,86,189,402,847,1760,3631,7438, 15165,30794,62343,125904,253783,510758,1026685, 2061730,4136991,8295872,16627167,33311646, 66716029,133582106,267406999,535206832,1071049287, 2143127030,4287918141,8578528818,17161414255] |