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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 8 |
| 6 | 18 |
| 7 | 41 |
| 8 | 98 |
| 9 | 237 |
| 10 | 591 |
| 11 | 1488 |
| 12 | 3805 |
| 13 | 9820 |
| 14 | 25593 |
| 15 | 67184 |
| 16 | 177604 |
| 17 | 472177 |
| 18 | 1261998 |
| 19 | 3388434 |
| 20 | 9136019 |
| 21 | 24724904 |
| 22 | 67141940 |
| 23 | 182892368 |
| 24 | 499608724 |
| 25 | 1368340326 |
| 26 | 3756651116 |
| 27 | 10336434585 |
| 28 | 28499309291 |
| 29 | 78727891420 |
| 30 | 217870037932 |
| 31 | 603934911859 |
| 32 | 1676720329410 |
[0,1,1,2,4,8,18,41,98,237,591,1488,3805,9820, 25593,67184,177604,472177,1261998,3388434,9136019, 24724904,67141940,182892368,499608724,1368340326, 3756651116,10336434585,28499309291,78727891420, 217870037932,603934911859,1676720329410] |