n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 21 |
3 | 112 |
4 | 615 |
5 | 3432 |
6 | 19383 |
7 | 110448 |
8 | 633726 |
9 | 3656360 |
10 | 21191555 |
11 | 123286440 |
12 | 719539015 |
13 | 4210967880 |
14 | 24702429825 |
15 | 145210795200 |
16 | 855172338570 |
17 | 5044470461352 |
18 | 29799593861974 |
19 | 176268499363840 |
20 | 1043889366927771 |
21 | 6188748520285584 |
22 | 36726461258947569 |
23 | 218146172715259488 |
24 | 1296812014083995850 |
[1,4,21,112,615,3432,19383,110448,633726,3656360, 21191555,123286440,719539015,4210967880, 24702429825,145210795200,855172338570, 5044470461352,29799593861974,176268499363840, 1043889366927771,6188748520285584, 36726461258947569,218146172715259488, 1296812014083995850] |