n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 20 |
4 | 132 |
5 | 1057 |
6 | 10036 |
7 | 110168 |
8 | 1369395 |
9 | 19009207 |
10 | 291638340 |
11 | 4898978911 |
12 | 89387432140 |
13 | 1760380295559 |
14 | 37222139393757 |
15 | 841009071062929 |
16 | 20219172890524757 |
17 | 515336552717107810 |
18 | 13879978696592456136 |
19 | 393920374851547833518 |
20 | 11749388855614114735431 |
[1,1,4,20,132,1057,10036,110168,1369395,19009207, 291638340,4898978911,89387432140,1760380295559, 37222139393757,841009071062929,20219172890524757, 515336552717107810,13879978696592456136, 393920374851547833518,11749388855614114735431] |