n | a(n) |
---|---|
0 | 3 |
1 | 15 |
2 | 70 |
3 | 315 |
4 | 1386 |
5 | 6006 |
6 | 25740 |
7 | 109395 |
8 | 461890 |
9 | 1939938 |
10 | 8112468 |
11 | 33801950 |
12 | 140408100 |
13 | 581690700 |
14 | 2404321560 |
15 | 9917826435 |
16 | 40838108850 |
17 | 167890003050 |
18 | 689232644100 |
19 | 2825853840810 |
20 | 11572544300460 |
21 | 47342226683700 |
22 | 193485622098600 |
23 | 790066290235950 |
24 | 3223470464162676 |
[3,15,70,315,1386,6006,25740,109395,461890, 1939938,8112468,33801950,140408100,581690700, 2404321560,9917826435,40838108850,167890003050, 689232644100,2825853840810,11572544300460, 47342226683700,193485622098600,790066290235950, 3223470464162676] |