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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 3 |
| 6 | 3 |
| 7 | 1 |
| 8 | 4 |
| 9 | 24 |
| 10 | 60 |
| 11 | 80 |
| 12 | 82 |
| 13 | 222 |
| 14 | 796 |
| 15 | 1848 |
| 16 | 2912 |
| 17 | 4452 |
| 18 | 11088 |
| 19 | 31592 |
| 20 | 70467 |
| 21 | 125437 |
| 22 | 231105 |
| 23 | 551775 |
| 24 | 1399069 |
| 25 | 3068219 |
| 26 | 5942937 |
| 27 | 12017739 |
| 28 | 27966515 |
| 29 | 66675777 |
| 30 | 145719483 |
| 31 | 298344501 |
| 32 | 632955999 |
| 33 | 1449806573 |
| 34 | 3346606719 |
| 35 | 7335193353 |
| 36 | 15557399668 |
[1,0,0,0,1,3,3,1,4,24,60,80,82,222,796,1848,2912, 4452,11088,31592,70467,125437,231105,551775, 1399069,3068219,5942937,12017739,27966515, 66675777,145719483,298344501,632955999,1449806573, 3346606719,7335193353,15557399668] |