n | a(n) |
---|---|
0 | 1 |
1 | 5 |
2 | 20 |
3 | 76 |
4 | 286 |
5 | 1078 |
6 | 4081 |
7 | 15521 |
8 | 59279 |
9 | 227239 |
10 | 873885 |
11 | 3370029 |
12 | 13027729 |
13 | 50469889 |
14 | 195892564 |
15 | 761615284 |
16 | 2965576714 |
17 | 11563073314 |
18 | 45141073924 |
19 | 176423482324 |
20 | 690215089744 |
21 | 2702831489824 |
22 | 10593202603774 |
23 | 41550902139550 |
24 | 163099562175850 |
25 | 640650742051802 |
[1,5,20,76,286,1078,4081,15521,59279,227239, 873885,3370029,13027729,50469889,195892564, 761615284,2965576714,11563073314,45141073924, 176423482324,690215089744,2702831489824, 10593202603774,41550902139550,163099562175850, 640650742051802] |