n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 7 |
5 | 23 |
6 | 115 |
7 | 694 |
8 | 5282 |
9 | 46066 |
10 | 456454 |
11 | 4999004 |
12 | 59916028 |
13 | 778525516 |
14 | 10897964660 |
15 | 163461964024 |
16 | 2615361578344 |
17 | 44460982752488 |
18 | 800296985768776 |
19 | 15205638776753680 |
20 | 304112757426239984 |
21 | 6386367801916347184 |
[1,1,2,7,23,115,694,5282,46066,456454,4999004, 59916028,778525516,10897964660,163461964024, 2615361578344,44460982752488,800296985768776, 15205638776753680,304112757426239984, 6386367801916347184] |