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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 26 |
| 4 | 92 |
| 5 | 2102 |
| 6 | 23102 |
| 7 | 60062 |
| 8 | 510512 |
| 9 | 29099072 |
| 10 | 3792578792 |
| 11 | 84106011992 |
| 12 | 2005604901302 |
| 13 | 252305096583542 |
| 14 | 11561510014033982 |
| 15 | 52331045326680122 |
| 16 | 31359378912013061912 |
| 17 | 1792403716245452460152 |
| 18 | 98060777857864844592572 |
| 19 | 3401363059422802158514832 |
[1,4,26,92,2102,23102,60062,510512,29099072, 3792578792,84106011992,2005604901302, 252305096583542,11561510014033982, 52331045326680122,31359378912013061912, 1792403716245452460152,98060777857864844592572, 3401363059422802158514832] |