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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 36 |
| 4 | 304 |
| 5 | 2973 |
| 6 | 33156 |
| 7 | 415962 |
| 8 | 5803307 |
| 9 | 89172846 |
| 10 | 1496858836 |
| 11 | 27258427263 |
| 12 | 535299208890 |
| 13 | 11277600621714 |
| 14 | 253741796354921 |
| 15 | 6072776118043704 |
| 16 | 154050364873902628 |
| 17 | 4128986249628307077 |
| 18 | 116598919802471049936 |
| 19 | 3460199566405679555310 |
| 20 | 107659401911343963741971 |
[1,5,36,304,2973,33156,415962,5803307,89172846, 1496858836,27258427263,535299208890, 11277600621714,253741796354921,6072776118043704, 154050364873902628,4128986249628307077, 116598919802471049936,3460199566405679555310, 107659401911343963741971] |