n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 18 |
4 | 96 |
5 | 265 |
6 | 672 |
7 | 1617 |
8 | 3776 |
9 | 8577 |
10 | 19080 |
11 | 41745 |
12 | 90048 |
13 | 191945 |
14 | 404992 |
15 | 846945 |
16 | 1757440 |
17 | 3621697 |
18 | 7417800 |
19 | 15109313 |
20 | 30623520 |
21 | 61788489 |
22 | 124158496 |
23 | 248549937 |
24 | 495852480 |
25 | 986076225 |
26 | 1955203016 |
27 | 3866245425 |
28 | 7625813888 |
29 | 15005718153 |
[1,4,18,96,265,672,1617,3776,8577,19080,41745, 90048,191945,404992,846945,1757440,3621697, 7417800,15109313,30623520,61788489,124158496, 248549937,495852480,986076225,1955203016, 3866245425,7625813888,15005718153] |