n | a(n) |
---|---|
0 | -2 |
1 | 3 |
2 | 6 |
3 | 21 |
4 | 90 |
5 | 429 |
6 | 2184 |
7 | 11628 |
8 | 63954 |
9 | 360525 |
10 | 2072070 |
11 | 12096045 |
12 | 71524440 |
13 | 427496076 |
14 | 2578547760 |
15 | 15675792072 |
16 | 95951017602 |
17 | 590842763469 |
18 | 3657598059570 |
19 | 22749427475775 |
20 | 142096423925610 |
21 | 890949529108485 |
22 | 5605635937900320 |
23 | 35380499289211440 |
24 | 223951032734902200 |
[-2,3,6,21,90,429,2184,11628,63954,360525,2072070, 12096045,71524440,427496076,2578547760, 15675792072,95951017602,590842763469, 3657598059570,22749427475775,142096423925610, 890949529108485,5605635937900320, 35380499289211440,223951032734902200] |