n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 12 |
3 | 54 |
4 | 230 |
5 | 948 |
6 | 3860 |
7 | 15624 |
8 | 63014 |
9 | 253588 |
10 | 1019072 |
11 | 4091174 |
12 | 16412668 |
13 | 65808044 |
14 | 263755984 |
15 | 1056789662 |
16 | 4233176854 |
17 | 16953418148 |
18 | 67885557896 |
19 | 271793651816 |
20 | 1088059997732 |
21 | 4355377285932 |
22 | 17432688395816 |
23 | 69770793302408 |
24 | 279227252601884 |
[0,2,12,54,230,948,3860,15624,63014,253588, 1019072,4091174,16412668,65808044,263755984, 1056789662,4233176854,16953418148,67885557896, 271793651816,1088059997732,4355377285932, 17432688395816,69770793302408,279227252601884] |