n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 110 |
3 | 2002 |
4 | 20020 |
5 | 136136 |
6 | 705432 |
7 | 2984520 |
8 | 10786908 |
9 | 34370050 |
10 | 98768670 |
11 | 260390130 |
12 | 638110200 |
13 | 1468635168 |
14 | 3200871520 |
15 | 6650874912 |
16 | 13248113736 |
17 | 25415833170 |
18 | 47143878782 |
19 | 84832157410 |
20 | 148507792972 |
21 | 253549890440 |
22 | 423093671000 |
23 | 691331713800 |
24 | 1107985378500 |
[0,2,110,2002,20020,136136,705432,2984520, 10786908,34370050,98768670,260390130,638110200, 1468635168,3200871520,6650874912,13248113736, 25415833170,47143878782,84832157410,148507792972, 253549890440,423093671000,691331713800, 1107985378500] |