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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 5 |
| 3 | 0 |
| 4 | 23 |
| 5 | 0 |
| 6 | 93 |
| 7 | 0 |
| 8 | 381 |
| 9 | 0 |
| 10 | 1493 |
| 11 | 0 |
| 12 | 6101 |
| 13 | 0 |
| 14 | 23893 |
| 15 | 0 |
| 16 | 97621 |
| 17 | 0 |
| 18 | 382293 |
| 19 | 0 |
| 20 | 1561941 |
| 21 | 0 |
| 22 | 6116693 |
| 23 | 0 |
| 24 | 24991061 |
| 25 | 0 |
| 26 | 97867093 |
| 27 | 0 |
| 28 | 399856981 |
| 29 | 0 |
| 30 | 1565873493 |
| 31 | 0 |
| 32 | 6397711701 |
| 33 | 0 |
| 34 | 25053975893 |
| 35 | 0 |
| 36 | 102363387221 |
| 37 | 0 |
| 38 | 400863614293 |
| 39 | 0 |
| 40 | 1637814195541 |
| 41 | 0 |
| 42 | 6413817828693 |
[1,0,5,0,23,0,93,0,381,0,1493,0,6101,0,23893,0, 97621,0,382293,0,1561941,0,6116693,0,24991061,0, 97867093,0,399856981,0,1565873493,0,6397711701,0, 25053975893,0,102363387221,0,400863614293,0, 1637814195541,0,6413817828693] |