n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 12 |
3 | 46 |
4 | 145 |
5 | 552 |
6 | 1820 |
7 | 6918 |
8 | 23562 |
9 | 89645 |
10 | 312664 |
11 | 1191885 |
12 | 4232345 |
13 | 16170728 |
14 | 58229100 |
15 | 222997812 |
16 | 811985790 |
17 | 3116622123 |
18 | 11451785640 |
19 | 44047806725 |
20 | 163072988442 |
21 | 628465576101 |
22 | 2341484487832 |
23 | 9040083756276 |
24 | 33863310322100 |
25 | 130957152428622 |
[1,4,12,46,145,552,1820,6918,23562,89645,312664, 1191885,4232345,16170728,58229100,222997812, 811985790,3116622123,11451785640,44047806725, 163072988442,628465576101,2341484487832, 9040083756276,33863310322100,130957152428622] |