n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 6 |
3 | 31 |
4 | 161 |
5 | 836 |
6 | 4341 |
7 | 22541 |
8 | 117046 |
9 | 607771 |
10 | 3155901 |
11 | 16387276 |
12 | 85092281 |
13 | 441848681 |
14 | 2294335686 |
15 | 11913527111 |
16 | 61861971241 |
17 | 321223383316 |
18 | 1667978887821 |
19 | 8661117822421 |
20 | 44973567999926 |
21 | 233528957822051 |
[1,1,6,31,161,836,4341,22541,117046,607771, 3155901,16387276,85092281,441848681,2294335686, 11913527111,61861971241,321223383316, 1667978887821,8661117822421,44973567999926, 233528957822051] |