n | a(n) |
---|---|
1 | 0 |
2 | 8 |
3 | 17 |
4 | 72 |
5 | 267 |
6 | 915 |
7 | 3407 |
8 | 12148 |
9 | 43820 |
10 | 158361 |
11 | 570132 |
12 | 2058621 |
13 | 7429283 |
14 | 26823311 |
15 | 96904923 |
16 | 350182773 |
17 | 1266059030 |
18 | 4579170527 |
19 | 16568732508 |
20 | 59974168593 |
21 | 217170088270 |
22 | 786671363225 |
23 | 2850611975840 |
24 | 10333040668513 |
25 | 37467797814236 |
26 | 135900958160905 |
[0,8,17,72,267,915,3407,12148,43820,158361,570132, 2058621,7429283,26823311,96904923,350182773, 1266059030,4579170527,16568732508,59974168593, 217170088270,786671363225,2850611975840, 10333040668513,37467797814236,135900958160905] |