n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 15 |
4 | 52 |
5 | 269 |
6 | 1110 |
7 | 5179 |
8 | 22568 |
9 | 102105 |
10 | 452458 |
11 | 2028071 |
12 | 9033180 |
13 | 40375141 |
14 | 180115262 |
15 | 804357075 |
16 | 3589982032 |
17 | 16027891889 |
18 | 71545586130 |
19 | 319397983039 |
20 | 1425797413508 |
21 | 6364972640445 |
22 | 28413716829478 |
[0,1,2,15,52,269,1110,5179,22568,102105,452458, 2028071,9033180,40375141,180115262,804357075, 3589982032,16027891889,71545586130,319397983039, 1425797413508,6364972640445,28413716829478] |