n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 20 |
6 | 72 |
7 | 272 |
8 | 1063 |
9 | 4262 |
10 | 17432 |
11 | 72448 |
12 | 305074 |
13 | 1298812 |
14 | 5581188 |
15 | 24175560 |
16 | 105448157 |
17 | 462745106 |
18 | 2041634108 |
19 | 9050879192 |
20 | 40296196096 |
21 | 180099939464 |
22 | 807757872276 |
23 | 3634378951656 |
24 | 16399912908504 |
25 | 74201196229816 |
[1,1,2,6,20,72,272,1063,4262,17432,72448,305074, 1298812,5581188,24175560,105448157,462745106, 2041634108,9050879192,40296196096,180099939464, 807757872276,3634378951656,16399912908504, 74201196229816] |