n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 18 |
4 | 75 |
5 | 320 |
6 | 1352 |
7 | 5733 |
8 | 24276 |
9 | 102850 |
10 | 435655 |
11 | 1845504 |
12 | 7817616 |
13 | 33116057 |
14 | 140281700 |
15 | 594243090 |
16 | 2517253683 |
17 | 10663258432 |
18 | 45170286424 |
19 | 191344405725 |
20 | 810547906740 |
21 | 3433536036866 |
22 | 14544692047439 |
23 | 61612304237568 |
[1,4,18,75,320,1352,5733,24276,102850,435655, 1845504,7817616,33116057,140281700,594243090, 2517253683,10663258432,45170286424,191344405725, 810547906740,3433536036866,14544692047439, 61612304237568] |