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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 32 |
| 3 | 154 |
| 4 | 863 |
| 5 | 8593 |
| 6 | 68656 |
| 7 | 714768 |
| 8 | 5434981 |
| 9 | 50877414 |
| 10 | 471428527 |
| 11 | 4205213351 |
| 12 | 37577387285 |
| 13 | 339146064380 |
| 14 | 3071290023220 |
| 15 | 27576889934192 |
| 16 | 248373790147986 |
| 17 | 2239574144400932 |
| 18 | 20171377813567936 |
| 19 | 181663159564517992 |
[0,32,154,863,8593,68656,714768,5434981,50877414, 471428527,4205213351,37577387285,339146064380, 3071290023220,27576889934192,248373790147986, 2239574144400932,20171377813567936, 181663159564517992] |