n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 7 |
4 | 24 |
5 | 81 |
6 | 274 |
7 | 927 |
8 | 3136 |
9 | 10609 |
10 | 35890 |
11 | 121415 |
12 | 410744 |
13 | 1389537 |
14 | 4700770 |
15 | 15902591 |
16 | 53798080 |
17 | 181997601 |
18 | 615693474 |
19 | 2082876103 |
20 | 7046319384 |
21 | 23837527729 |
22 | 80641778674 |
23 | 272809183135 |
24 | 922906855808 |
25 | 3122171529233 |
[0,1,2,7,24,81,274,927,3136,10609,35890,121415, 410744,1389537,4700770,15902591,53798080, 181997601,615693474,2082876103,7046319384, 23837527729,80641778674,272809183135,922906855808, 3122171529233] |