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| n | a(n) |
|---|---|
| 1 | 19 |
| 2 | 361 |
| 3 | 1080 |
| 4 | 6952 |
| 5 | 38160 |
| 6 | 205258 |
| 7 | 1153532 |
| 8 | 6420722 |
| 9 | 35306016 |
| 10 | 196164150 |
| 11 | 1088708030 |
| 12 | 6022687942 |
| 13 | 33388715092 |
| 14 | 185122745390 |
| 15 | 1025484329530 |
| 16 | 5683145307278 |
| 17 | 31499382991888 |
| 18 | 174545900126878 |
| 19 | 967280691347214 |
[19,361,1080,6952,38160,205258,1153532,6420722, 35306016,196164150,1088708030,6022687942, 33388715092,185122745390,1025484329530, 5683145307278,31499382991888,174545900126878, 967280691347214] |