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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 28 |
| 2 | 518 |
| 3 | 7439 |
| 4 | 90517 |
| 5 | 972398 |
| 6 | 9472190 |
| 7 | 85145743 |
| 8 | 715281840 |
| 9 | 5668682493 |
| 10 | 42691867112 |
| 11 | 307312234334 |
| 12 | 2124355701646 |
| 13 | 14157081285263 |
| 14 | 91250293831492 |
| 15 | 570441761053192 |
| 16 | 3466874635995098 |
| 17 | 20526329624103412 |
| 18 | 118608374492197651 |
| 19 | 669949478060261642 |
[1,28,518,7439,90517,972398,9472190,85145743, 715281840,5668682493,42691867112,307312234334, 2124355701646,14157081285263,91250293831492, 570441761053192,3466874635995098, 20526329624103412,118608374492197651, 669949478060261642] |