n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 8 |
4 | 46 |
5 | 324 |
6 | 2708 |
7 | 26424 |
8 | 295272 |
9 | 3714600 |
10 | 51929472 |
11 | 798610416 |
12 | 13399081584 |
13 | 243556758912 |
14 | 4767863027328 |
15 | 100004300847744 |
16 | 2237419620187776 |
17 | 53187370914349440 |
18 | 1338737435337261312 |
19 | 35568441673932566016 |
20 | 994744655047298951424 |
21 | 29211127285363209561600 |
[1,1,2,8,46,324,2708,26424,295272,3714600, 51929472,798610416,13399081584,243556758912, 4767863027328,100004300847744,2237419620187776, 53187370914349440,1338737435337261312, 35568441673932566016,994744655047298951424, 29211127285363209561600] |