n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 12 |
4 | 53 |
5 | 244 |
6 | 1152 |
7 | 5531 |
8 | 26875 |
9 | 131760 |
10 | 650492 |
11 | 3229368 |
12 | 16105344 |
13 | 80624935 |
14 | 404913225 |
15 | 2039146908 |
16 | 10293657125 |
17 | 52071019600 |
18 | 263888886528 |
19 | 1339540863092 |
20 | 6809667715812 |
21 | 34663102092960 |
22 | 176655038497000 |
23 | 901269559693104 |
[1,1,3,12,53,244,1152,5531,26875,131760,650492, 3229368,16105344,80624935,404913225,2039146908, 10293657125,52071019600,263888886528, 1339540863092,6809667715812,34663102092960, 176655038497000,901269559693104] |