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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 31 |
| 4 | 697 |
| 5 | 25761 |
| 6 | 1371691 |
| 7 | 97677343 |
| 8 | 8869533681 |
| 9 | 993709302337 |
| 10 | 134086553693011 |
| 11 | 21392941696576671 |
| 12 | 3977310371182762153 |
| 13 | 851537642070562468321 |
| 14 | 207892899850805427254907 |
| 15 | 57394298500033495294907551 |
| 16 | 17789220343418322663802383841 |
| 17 | 6151146653207427022767433596033 |
| 18 | 2359535664677835451305256629862051 |
| 19 | 999033160522078788619730346474821407 |
[1,1,3,31,697,25761,1371691,97677343,8869533681, 993709302337,134086553693011,21392941696576671, 3977310371182762153,851537642070562468321, 207892899850805427254907, 57394298500033495294907551, 17789220343418322663802383841, 6151146653207427022767433596033, 2359535664677835451305256629862051, 999033160522078788619730346474821407] |