n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 3 |
4 | 18 |
5 | 90 |
6 | 390 |
7 | 2205 |
8 | 10878 |
9 | 45318 |
10 | 256350 |
11 | 5530305 |
12 | 55869330 |
13 | 865551258 |
14 | 9892489698 |
15 | 78223384785 |
16 | 470010394350 |
17 | 24530527675230 |
18 | 409760923017198 |
19 | 10595007772540113 |
20 | 160826214447439770 |
21 | 1585844008081570650 |
22 | 16787211082925012730 |
23 | 1362379219330719093273 |
[0,0,3,18,90,390,2205,10878,45318,256350,5530305, 55869330,865551258,9892489698,78223384785, 470010394350,24530527675230,409760923017198, 10595007772540113,160826214447439770, 1585844008081570650,16787211082925012730, 1362379219330719093273] |