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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 22 |
| 5 | 352 |
| 6 | 13412 |
| 7 | 932768 |
| 8 | 125776816 |
| 9 | 33148125376 |
| 10 | 17248244478848 |
| 11 | 17820828772662272 |
| 12 | 36677298103403269504 |
| 13 | 150636101324831804975104 |
| 14 | 1235824405515221870758956032 |
| 15 | 20263840468865240117261288526848 |
| 16 | 664289479167891600504170147259897856 |
[0,1,1,22,352,13412,932768,125776816,33148125376, 17248244478848,17820828772662272, 36677298103403269504,150636101324831804975104, 1235824405515221870758956032, 20263840468865240117261288526848, 664289479167891600504170147259897856] |