n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 21 |
5 | 98 |
6 | 547 |
7 | 3556 |
8 | 26738 |
9 | 227720 |
10 | 2170267 |
11 | 22877331 |
12 | 264314464 |
13 | 3320870054 |
14 | 45076422125 |
15 | 657316885209 |
16 | 10247614197601 |
17 | 170081414212020 |
18 | 2994059471570761 |
19 | 55718507205774017 |
20 | 1092932100469356250 |
21 | 22536709415953547880 |
22 | 487361620197926253365 |
[0,1,2,6,21,98,547,3556,26738,227720,2170267, 22877331,264314464,3320870054,45076422125, 657316885209,10247614197601,170081414212020, 2994059471570761,55718507205774017, 1092932100469356250,22536709415953547880, 487361620197926253365] |