n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 12 |
4 | 44 |
5 | 171 |
6 | 683 |
7 | 2816 |
8 | 11893 |
9 | 51350 |
10 | 224098 |
11 | 991506 |
12 | 4437757 |
13 | 20006333 |
14 | 90924488 |
15 | 415980396 |
16 | 1913682104 |
17 | 8847746238 |
18 | 41091054180 |
19 | 191607760032 |
20 | 896578541595 |
21 | 4209023017990 |
22 | 19817896294387 |
23 | 93556842240115 |
24 | 442750975652565 |
25 | 2100004692492617 |
26 | 9981048900376549 |
27 | 47529264968202643 |
[1,1,4,12,44,171,683,2816,11893,51350,224098, 991506,4437757,20006333,90924488,415980396, 1913682104,8847746238,41091054180,191607760032, 896578541595,4209023017990,19817896294387, 93556842240115,442750975652565,2100004692492617, 9981048900376549,47529264968202643] |