n | a(n) |
---|---|
1 | 4 |
2 | 11 |
3 | 31 |
4 | 89 |
5 | 251 |
6 | 715 |
7 | 2028 |
8 | 5761 |
9 | 16358 |
10 | 46452 |
11 | 131910 |
12 | 374581 |
13 | 1063696 |
14 | 3020560 |
15 | 8577449 |
16 | 24357268 |
17 | 69167021 |
18 | 196412696 |
19 | 557750593 |
20 | 1583837157 |
21 | 4497601906 |
22 | 12771782030 |
23 | 36267864414 |
24 | 102989386002 |
25 | 292457628811 |
26 | 830488149997 |
[4,11,31,89,251,715,2028,5761,16358,46452,131910, 374581,1063696,3020560,8577449,24357268,69167021, 196412696,557750593,1583837157,4497601906, 12771782030,36267864414,102989386002,292457628811, 830488149997] |