n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 1 |
3 | 6 |
4 | 11 |
5 | 68 |
6 | 177 |
7 | 1215 |
8 | 4059 |
9 | 30733 |
10 | 124408 |
11 | 1027972 |
12 | 4862600 |
13 | 43450761 |
14 | 234283662 |
15 | 2247091674 |
16 | 13563976285 |
17 | 138780931929 |
18 | 925063455844 |
19 | 10044476018973 |
20 | 73144254450840 |
21 | 839146997933059 |
22 | 6618306039456419 |
[0,1,1,6,11,68,177,1215,4059,30733,124408,1027972, 4862600,43450761,234283662,2247091674,13563976285, 138780931929,925063455844,10044476018973, 73144254450840,839146997933059,6618306039456419] |