n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 21 |
4 | 95 |
5 | 816 |
6 | 3626 |
7 | 31005 |
8 | 137711 |
9 | 1177392 |
10 | 5229410 |
11 | 44709909 |
12 | 198579887 |
13 | 1697799168 |
14 | 7540806314 |
15 | 64471658493 |
16 | 286352060063 |
17 | 2448225223584 |
18 | 10873837476098 |
19 | 92968086837717 |
20 | 412919472031679 |
21 | 3530339074609680 |
22 | 15680066099727722 |
23 | 134059916748330141 |
[0,2,21,95,816,3626,31005,137711,1177392,5229410, 44709909,198579887,1697799168,7540806314, 64471658493,286352060063,2448225223584, 10873837476098,92968086837717,412919472031679, 3530339074609680,15680066099727722, 134059916748330141] |