n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 18 |
3 | 72 |
4 | 294 |
5 | 1168 |
6 | 4686 |
7 | 18728 |
8 | 74886 |
9 | 299632 |
10 | 1198414 |
11 | 4793384 |
12 | 19174278 |
13 | 76696176 |
14 | 306782542 |
15 | 1227136040 |
16 | 4908536710 |
17 | 19634129520 |
18 | 78536565070 |
19 | 314146200616 |
20 | 1256584663942 |
21 | 5026339031664 |
22 | 20105355649358 |
23 | 80421421489192 |
24 | 321685688963974 |
[1,4,18,72,294,1168,4686,18728,74886,299632, 1198414,4793384,19174278,76696176,306782542, 1227136040,4908536710,19634129520,78536565070, 314146200616,1256584663942,5026339031664, 20105355649358,80421421489192,321685688963974] |