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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 22 |
| 3 | 438 |
| 4 | 12824 |
| 5 | 496370 |
| 6 | 23914512 |
| 7 | 1379269094 |
| 8 | 92667551104 |
| 9 | 7108231236066 |
| 10 | 612974464428800 |
| 11 | 58702772664490262 |
| 12 | 6181602019316333568 |
| 13 | 709911177607125141362 |
| 14 | 88301595129435811723264 |
| 15 | 11825985945777638231211750 |
| 16 | 1696696168760520436580974592 |
| 17 | 259624546758869333450285984066 |
[1,2,22,438,12824,496370,23914512,1379269094, 92667551104,7108231236066,612974464428800, 58702772664490262,6181602019316333568, 709911177607125141362,88301595129435811723264, 11825985945777638231211750, 1696696168760520436580974592, 259624546758869333450285984066] |