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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 15 |
| 3 | 385 |
| 4 | 5005 |
| 5 | 323323 |
| 6 | 7436429 |
| 7 | 955049953 |
| 8 | 35336848261 |
| 9 | 1448810778701 |
| 10 | 62298863484143 |
| 11 | 14107860812636383 |
| 12 | 832363787945546597 |
| 13 | 261682369333342226303 |
| 14 | 18579448222667298067513 |
| 15 | 1356299720254712758928449 |
| 16 | 107147677900122307955347471 |
| 17 | 46558817449894322874479515781 |
[1,2,15,385,5005,323323,7436429,955049953, 35336848261,1448810778701,62298863484143, 14107860812636383,832363787945546597, 261682369333342226303,18579448222667298067513, 1356299720254712758928449, 107147677900122307955347471, 46558817449894322874479515781] |