n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 0 |
3 | 2 |
4 | 2 |
5 | 14 |
6 | 42 |
7 | 244 |
8 | 1208 |
9 | 7930 |
10 | 52710 |
11 | 405850 |
12 | 3310702 |
13 | 29742388 |
14 | 285103536 |
15 | 2943395390 |
16 | 32318674810 |
17 | 377660270510 |
18 | 4668433604250 |
19 | 60946384750028 |
20 | 837286564780496 |
21 | 12079835055678770 |
22 | 182562305754119886 |
23 | 2884622329374990250 |
24 | 47559525570125238782 |
[1,1,0,2,2,14,42,244,1208,7930,52710,405850, 3310702,29742388,285103536,2943395390,32318674810, 377660270510,4668433604250,60946384750028, 837286564780496,12079835055678770, 182562305754119886,2884622329374990250, 47559525570125238782] |