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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 13 |
| 3 | 16 |
| 4 | 245 |
| 5 | 1128 |
| 6 | 10534 |
| 7 | 71248 |
| 8 | 652036 |
| 9 | 5141408 |
| 10 | 45081311 |
| 11 | 377481816 |
| 12 | 3256166909 |
| 13 | 27751269104 |
| 14 | 238314397799 |
| 15 | 2040642918208 |
| 16 | 17506339185192 |
| 17 | 150079258587200 |
| 18 | 1287249575901534 |
| 19 | 11038702753296720 |
| 20 | 94675989650833007 |
| 21 | 811957493293460552 |
| 22 | 6963826351562090734 |
[1,0,13,16,245,1128,10534,71248,652036,5141408, 45081311,377481816,3256166909,27751269104, 238314397799,2040642918208,17506339185192, 150079258587200,1287249575901534, 11038702753296720,94675989650833007, 811957493293460552,6963826351562090734] |