n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 10 |
3 | 60 |
4 | 406 |
5 | 2940 |
6 | 22308 |
7 | 175032 |
8 | 1408550 |
9 | 11561836 |
10 | 96425836 |
11 | 814773960 |
12 | 6960289532 |
13 | 60012947800 |
14 | 521582661000 |
15 | 4564643261040 |
16 | 40190674554630 |
17 | 355772529165900 |
18 | 3164408450118300 |
19 | 28266363849505320 |
20 | 253466716153665300 |
21 | 2280803103062033160 |
22 | 20588945107316958840 |
[1,2,10,60,406,2940,22308,175032,1408550,11561836, 96425836,814773960,6960289532,60012947800, 521582661000,4564643261040,40190674554630, 355772529165900,3164408450118300, 28266363849505320,253466716153665300, 2280803103062033160,20588945107316958840] |