n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 15 |
3 | 88 |
4 | 564 |
5 | 3819 |
6 | 26851 |
7 | 194025 |
8 | 1431498 |
9 | 10735548 |
10 | 81580008 |
11 | 626697786 |
12 | 4858272450 |
13 | 37954323885 |
14 | 298487957670 |
15 | 2361025981335 |
16 | 18770449480056 |
17 | 149897172319290 |
18 | 1201831832357041 |
19 | 9670416882346848 |
20 | 78062823843714528 |
21 | 631988009034161246 |
[1,3,15,88,564,3819,26851,194025,1431498,10735548, 81580008,626697786,4858272450,37954323885, 298487957670,2361025981335,18770449480056, 149897172319290,1201831832357041,9670416882346848, 78062823843714528,631988009034161246] |