n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 2 |
4 | 13 |
5 | 94 |
6 | 866 |
7 | 9652 |
8 | 126689 |
9 | 1914412 |
10 | 32736453 |
11 | 624968662 |
12 | 13176422634 |
13 | 304071291562 |
14 | 7623501667031 |
15 | 206342778454312 |
16 | 5996836998828457 |
17 | 186254702081260312 |
18 | 6156752652130549218 |
19 | 215810382437839251562 |
20 | 7995774669321944270390 |
21 | 312215963278285442939062 |
[0,0,2,13,94,866,9652,126689,1914412,32736453, 624968662,13176422634,304071291562,7623501667031, 206342778454312,5996836998828457, 186254702081260312,6156752652130549218, 215810382437839251562,7995774669321944270390, 312215963278285442939062] |