n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 18 |
5 | 78 |
6 | 426 |
7 | 2286 |
8 | 15402 |
9 | 122190 |
10 | 951546 |
11 | 8724078 |
12 | 90768378 |
13 | 928340190 |
14 | 10779805722 |
15 | 138779942046 |
16 | 1759271695338 |
17 | 24739709631678 |
18 | 379578822373866 |
19 | 5743346972756526 |
20 | 94864142045862282 |
21 | 1689637343582548590 |
22 | 29717468115957434586 |
23 | 563879701735681033998 |
[1,1,2,6,18,78,426,2286,15402,122190,951546, 8724078,90768378,928340190,10779805722, 138779942046,1759271695338,24739709631678, 379578822373866,5743346972756526, 94864142045862282,1689637343582548590, 29717468115957434586,563879701735681033998] |