Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
n | a(n) |
---|---|
1 | 0 |
2 | 3 |
3 | 12 |
4 | 84 |
5 | 498 |
6 | 3090 |
7 | 18930 |
8 | 116382 |
9 | 714810 |
10 | 4391526 |
11 | 26977818 |
12 | 165732438 |
13 | 1018135578 |
14 | 6254670486 |
15 | 38424042426 |
16 | 236048762550 |
17 | 1450108129242 |
18 | 8908386492054 |
19 | 54726504918906 |
20 | 336198967755510 |
21 | 2065356559176474 |
[0,3,12,84,498,3090,18930,116382,714810,4391526, 26977818,165732438,1018135578,6254670486, 38424042426,236048762550,1450108129242, 8908386492054,54726504918906,336198967755510, 2065356559176474] |