n | a(n) |
---|---|
0 | 4 |
1 | 1 |
2 | 1 |
3 | 3 |
4 | 8 |
5 | 35 |
6 | 185 |
7 | 1155 |
8 | 8377 |
9 | 69106 |
10 | 639233 |
11 | 6552134 |
12 | 73711509 |
13 | 902965986 |
14 | 11964299312 |
15 | 170491265198 |
16 | 2599991794272 |
17 | 42249866656927 |
18 | 728810199831991 |
19 | 13300786146933842 |
20 | 256040133328476466 |
[4,1,1,3,8,35,185,1155,8377,69106,639233,6552134, 73711509,902965986,11964299312,170491265198, 2599991794272,42249866656927,728810199831991, 13300786146933842,256040133328476466] |