n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 28 |
3 | 248 |
4 | 2480 |
5 | 26688 |
6 | 301648 |
7 | 3531424 |
8 | 42449088 |
9 | 520858496 |
10 | 6497190528 |
11 | 82146802944 |
12 | 1050370074624 |
13 | 13559126110720 |
14 | 176469550681344 |
15 | 2313050095245824 |
16 | 30506619439926272 |
17 | 404558181197010944 |
18 | 5391161355764205568 |
19 | 72156618656648237056 |
20 | 969557980700415827968 |
[1,4,28,248,2480,26688,301648,3531424,42449088, 520858496,6497190528,82146802944,1050370074624, 13559126110720,176469550681344,2313050095245824, 30506619439926272,404558181197010944, 5391161355764205568,72156618656648237056, 969557980700415827968] |