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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | 6 |
| 4 | 6 |
| 5 | 75 |
| 6 | 1025 |
| 7 | 1225 |
| 8 | 43988 |
| 9 | 471345 |
| 10 | 5084387 |
| 11 | 40870181 |
| 12 | 866782774 |
| 13 | 8473297261 |
| 14 | 165871287465 |
| 15 | 3934845305287 |
| 16 | 23390789927784 |
| 17 | 956832091069057 |
| 18 | 21869141108144439 |
| 19 | 269518811758178785 |
| 20 | 8437830353620298346 |
| 21 | 220696789738463945981 |
| 22 | 3231280243441039496181 |
| 23 | 125072102239522472394691 |
[1,1,0,6,6,75,1025,1225,43988,471345,5084387, 40870181,866782774,8473297261,165871287465, 3934845305287,23390789927784,956832091069057, 21869141108144439,269518811758178785, 8437830353620298346,220696789738463945981, 3231280243441039496181,125072102239522472394691] |