n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 4 |
4 | 19 |
5 | 80 |
6 | 638 |
7 | 6054 |
8 | 76692 |
9 | 1137284 |
10 | 19405244 |
11 | 370597430 |
12 | 7825459362 |
13 | 180862277352 |
14 | 4540781512946 |
15 | 123053646087312 |
16 | 3580073396748560 |
17 | 111297799861936256 |
18 | 3682093529146577694 |
19 | 129163727524848878358 |
20 | 4788738149626920381804 |
21 | 187102616692953377567060 |
[0,2,4,19,80,638,6054,76692,1137284,19405244, 370597430,7825459362,180862277352,4540781512946, 123053646087312,3580073396748560, 111297799861936256,3682093529146577694, 129163727524848878358,4788738149626920381804, 187102616692953377567060] |