n | a(n) |
---|---|
4 | 4 |
5 | 20 |
6 | 90 |
7 | 392 |
8 | 1652 |
9 | 6804 |
10 | 27600 |
11 | 110715 |
12 | 440374 |
13 | 1740024 |
14 | 6838832 |
15 | 26762645 |
16 | 104356980 |
17 | 405706292 |
18 | 1573256772 |
19 | 6087597150 |
20 | 23511579564 |
21 | 90659983064 |
22 | 349090305487 |
23 | 1342531370565 |
24 | 5157512878694 |
25 | 19794331541270 |
26 | 75905591609120 |
27 | 290857683782250 |
28 | 1113774550930080 |
[4,20,90,392,1652,6804,27600,110715,440374, 1740024,6838832,26762645,104356980,405706292, 1573256772,6087597150,23511579564,90659983064, 349090305487,1342531370565,5157512878694, 19794331541270,75905591609120,290857683782250, 1113774550930080] |