n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 9 |
4 | 23 |
5 | 62 |
6 | 179 |
7 | 571 |
8 | 1888 |
9 | 6309 |
10 | 21114 |
11 | 71387 |
12 | 245162 |
13 | 854703 |
14 | 3010602 |
15 | 10673814 |
16 | 38036229 |
17 | 136250135 |
18 | 490696565 |
19 | 1776089734 |
20 | 6456234450 |
21 | 23554296293 |
22 | 86210280655 |
23 | 316481218498 |
24 | 1165089759958 |
25 | 4300364442451 |
26 | 15910717070706 |
27 | 58996259565000 |
[1,1,3,9,23,62,179,571,1888,6309,21114,71387, 245162,854703,3010602,10673814,38036229,136250135, 490696565,1776089734,6456234450,23554296293, 86210280655,316481218498,1165089759958, 4300364442451,15910717070706,58996259565000] |