n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 9 |
3 | 45 |
4 | 173 |
5 | 573 |
6 | 1725 |
7 | 4861 |
8 | 13053 |
9 | 33789 |
10 | 84989 |
11 | 208893 |
12 | 503805 |
13 | 1196029 |
14 | 2801661 |
15 | 6488061 |
16 | 14876669 |
17 | 33816573 |
18 | 76283901 |
19 | 170917885 |
20 | 380633085 |
21 | 843055101 |
22 | 1858076669 |
23 | 4076863485 |
24 | 8908701693 |
25 | 19394461693 |
26 | 42077257725 |
27 | 90999619581 |
28 | 196226318333 |
[0,1,9,45,173,573,1725,4861,13053,33789,84989, 208893,503805,1196029,2801661,6488061,14876669, 33816573,76283901,170917885,380633085,843055101, 1858076669,4076863485,8908701693,19394461693, 42077257725,90999619581,196226318333] |