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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 3 |
| 3 | 4 |
| 4 | 20 |
| 5 | 26 |
| 6 | 101 |
| 7 | 168 |
| 8 | 445 |
| 9 | 813 |
| 10 | 1804 |
| 11 | 3246 |
| 12 | 6527 |
| 13 | 11455 |
| 14 | 21193 |
| 15 | 36168 |
| 16 | 63077 |
| 17 | 104034 |
| 18 | 173255 |
| 19 | 277043 |
| 20 | 443629 |
| 21 | 689569 |
| 22 | 1068616 |
| 23 | 1618029 |
| 24 | 2438122 |
| 25 | 3605596 |
| 26 | 5300598 |
| 27 | 7674008 |
| 28 | 11039330 |
| 29 | 15676558 |
| 30 | 22120111 |
| 31 | 30867691 |
| 32 | 42805706 |
| 33 | 58792192 |
| 34 | 80263432 |
| 35 | 108650796 |
[1,0,3,4,20,26,101,168,445,813,1804,3246,6527, 11455,21193,36168,63077,104034,173255,277043, 443629,689569,1068616,1618029,2438122,3605596, 5300598,7674008,11039330,15676558,22120111, 30867691,42805706,58792192,80263432,108650796] |