n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 12 |
3 | 36 |
4 | 108 |
5 | 314 |
6 | 906 |
7 | 2576 |
8 | 7280 |
9 | 20352 |
10 | 56664 |
11 | 156570 |
12 | 431238 |
13 | 1180968 |
14 | 3225940 |
15 | 8773036 |
16 | 23809148 |
17 | 64388402 |
18 | 173829458 |
19 | 467950860 |
20 | 1257901236 |
21 | 3373450744 |
22 | 9035758992 |
23 | 24155031526 |
24 | 64504264538 |
25 | 171971885000 |
26 | 458064299228 |
27 | 1218407840776 |
28 | 3238253213404 |
29 | 8596370674894 |
[1,4,12,36,108,314,906,2576,7280,20352,56664, 156570,431238,1180968,3225940,8773036,23809148, 64388402,173829458,467950860,1257901236, 3373450744,9035758992,24155031526,64504264538, 171971885000,458064299228,1218407840776, 3238253213404,8596370674894] |