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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 2 |
| 3 | 10 |
| 4 | 88 |
| 5 | 978 |
| 6 | 13468 |
| 7 | 221338 |
| 8 | 4233584 |
| 9 | 92458018 |
| 10 | 2271283684 |
| 11 | 62012911530 |
| 12 | 1863436238728 |
| 13 | 61124896911154 |
| 14 | 2173660174175228 |
| 15 | 83304031307483962 |
| 16 | 3423089366607304672 |
| 17 | 150143469737701318722 |
| 18 | 7001969736087834197716 |
| 19 | 345972733119776006045386 |
[1,0,2,10,88,978,13468,221338,4233584,92458018, 2271283684,62012911530,1863436238728, 61124896911154,2173660174175228,83304031307483962, 3423089366607304672,150143469737701318722, 7001969736087834197716,345972733119776006045386] |