n | a(n) |
---|---|
6 | 1 |
7 | 21 |
8 | 266 |
9 | 2646 |
10 | 22827 |
11 | 179487 |
12 | 1323652 |
13 | 9321312 |
14 | 63436373 |
15 | 420693273 |
16 | 2734926558 |
17 | 17505749898 |
18 | 110687251039 |
19 | 693081601779 |
20 | 4306078895384 |
21 | 26585679462804 |
22 | 163305339345225 |
23 | 998969857983405 |
24 | 6090236036084530 |
25 | 37026417000002430 |
26 | 224595186974125331 |
[1,21,266,2646,22827,179487,1323652,9321312, 63436373,420693273,2734926558,17505749898, 110687251039,693081601779,4306078895384, 26585679462804,163305339345225,998969857983405, 6090236036084530,37026417000002430, 224595186974125331] |