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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 36 |
| 3 | 365 |
| 4 | 3892 |
| 5 | 42714 |
| 6 | 477621 |
| 7 | 5411109 |
| 8 | 61901268 |
| 9 | 713435333 |
| 10 | 8271470666 |
| 11 | 96361329024 |
| 12 | 1127086021461 |
| 13 | 13227336997645 |
| 14 | 155680966681101 |
| 15 | 1836862248992565 |
| 16 | 21719923705450260 |
| 17 | 257316706385394615 |
| 18 | 3053599633736172765 |
| 19 | 36292098436808314572 |
| 20 | 431918050456887676362 |
[1,4,36,365,3892,42714,477621,5411109,61901268, 713435333,8271470666,96361329024,1127086021461, 13227336997645,155680966681101,1836862248992565, 21719923705450260,257316706385394615, 3053599633736172765,36292098436808314572, 431918050456887676362] |