n | a(n) |
---|---|
1 | 1 |
2 | 0 |
3 | 0 |
4 | 8 |
5 | 15 |
6 | 144 |
7 | 910 |
8 | 7440 |
9 | 66717 |
10 | 667520 |
11 | 7342236 |
12 | 88107480 |
13 | 1145396395 |
14 | 16035550608 |
15 | 240533257770 |
16 | 3848532125984 |
17 | 65425046139705 |
18 | 1177650830517120 |
19 | 22375365779822392 |
20 | 447507315596451240 |
21 | 9397653627525472071 |
22 | 206748379805560390160 |
23 | 4755212735527888968390 |
[1,0,0,8,15,144,910,7440,66717,667520,7342236, 88107480,1145396395,16035550608,240533257770, 3848532125984,65425046139705,1177650830517120, 22375365779822392,447507315596451240, 9397653627525472071,206748379805560390160, 4755212735527888968390] |