n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 8 |
3 | 54 |
4 | 320 |
5 | 1750 |
6 | 9072 |
7 | 45276 |
8 | 219648 |
9 | 1042470 |
10 | 4862000 |
11 | 22355476 |
12 | 101582208 |
13 | 457002364 |
14 | 2038517600 |
15 | 9026235000 |
16 | 39710085120 |
17 | 173712232710 |
18 | 756088415280 |
19 | 3276123843300 |
20 | 14138105520000 |
21 | 60790319209620 |
22 | 260516811228960 |
23 | 1113068351807880 |
24 | 4742456099097600 |
25 | 20154752301937500 |
26 | 85453569951920352 |
[0,1,8,54,320,1750,9072,45276,219648,1042470, 4862000,22355476,101582208,457002364,2038517600, 9026235000,39710085120,173712232710,756088415280, 3276123843300,14138105520000,60790319209620, 260516811228960,1113068351807880,4742456099097600, 20154752301937500,85453569951920352] |