n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 12 |
4 | 57 |
5 | 276 |
6 | 1465 |
7 | 8008 |
8 | 45408 |
9 | 263168 |
10 | 1554582 |
11 | 9318412 |
12 | 56549840 |
13 | 346717662 |
14 | 2144555617 |
15 | 13365472929 |
16 | 83848948043 |
17 | 529091046781 |
18 | 3355802952070 |
[1,4,12,57,276,1465,8008,45408,263168,1554582, 9318412,56549840,346717662,2144555617,13365472929, 83848948043,529091046781,3355802952070] |