n | a(n) |
---|---|
2 | 1 |
3 | 4 |
4 | 13 |
5 | 42 |
6 | 148 |
7 | 540 |
8 | 1945 |
9 | 6994 |
10 | 25784 |
11 | 96564 |
12 | 361560 |
13 | 1353608 |
14 | 5113044 |
15 | 19462184 |
16 | 74227737 |
17 | 283335006 |
18 | 1085696746 |
19 | 4176869836 |
20 | 16100775648 |
21 | 62132631186 |
22 | 240258482330 |
23 | 931152718588 |
24 | 3614359486290 |
25 | 14044139747816 |
[1,4,13,42,148,540,1945,6994,25784,96564,361560, 1353608,5113044,19462184,74227737,283335006, 1085696746,4176869836,16100775648,62132631186, 240258482330,931152718588,3614359486290, 14044139747816] |