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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 1 |
| 6 | 9 |
| 7 | 11 |
| 8 | 34 |
| 9 | 53 |
| 10 | 108 |
| 11 | 169 |
| 12 | 400 |
| 13 | 680 |
| 14 | 1530 |
| 15 | 2984 |
| 16 | 6362 |
| 17 | 12498 |
| 18 | 25766 |
| 19 | 50093 |
| 20 | 102126 |
| 21 | 199309 |
| 22 | 400288 |
| 23 | 788227 |
| 24 | 1581584 |
| 25 | 3135117 |
| 26 | 6286310 |
| 27 | 12532861 |
| 28 | 25121292 |
| 29 | 50184582 |
| 30 | 100627207 |
| 31 | 201208477 |
| 32 | 403170900 |
| 33 | 806534560 |
| 34 | 1615151111 |
| 35 | 3231224804 |
| 36 | 6467909442 |
[1,0,1,1,2,1,9,11,34,53,108,169,400,680,1530,2984, 6362,12498,25766,50093,102126,199309,400288, 788227,1581584,3135117,6286310,12532861,25121292, 50184582,100627207,201208477,403170900,806534560, 1615151111,3231224804,6467909442] |