n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 9 |
4 | 40 |
5 | 242 |
6 | 1528 |
7 | 10664 |
8 | 76956 |
9 | 575245 |
10 | 4395910 |
11 | 34131621 |
12 | 268146598 |
13 | 2122399923 |
14 | 16884293154 |
15 | 134689290877 |
16 | 1075641369024 |
17 | 8588548510081 |
18 | 68496446989330 |
19 | 545303352881863 |
20 | 4331918361300882 |
21 | 34337864000400360 |
22 | 271657823631727330 |
23 | 2146133623039711577 |
[1,1,2,9,40,242,1528,10664,76956,575245,4395910, 34131621,268146598,2122399923,16884293154, 134689290877,1075641369024,8588548510081, 68496446989330,545303352881863,4331918361300882, 34337864000400360,271657823631727330, 2146133623039711577] |