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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 23 |
| 3 | 73 |
| 4 | 1579 |
| 5 | 8879 |
| 6 | 179617 |
| 7 | 1511467 |
| 8 | 28410041 |
| 9 | 330703441 |
| 10 | 5730852343 |
| 11 | 88406712593 |
| 12 | 1399170969139 |
| 13 | 27921184747039 |
| 14 | 398888195476097 |
| 15 | 10171302856939747 |
| 16 | 129240467589656881 |
| 17 | 4197761610365555681 |
| 18 | 46531675504873063063 |
| 19 | 1935524400169373119513 |
[1,1,23,73,1579,8879,179617,1511467,28410041, 330703441,5730852343,88406712593,1399170969139, 27921184747039,398888195476097,10171302856939747, 129240467589656881,4197761610365555681, 46531675504873063063,1935524400169373119513] |