n | a(n) |
---|---|
0 | 1 |
1 | 9 |
2 | 34 |
3 | 125 |
4 | 462 |
5 | 1722 |
6 | 6468 |
7 | 24453 |
8 | 92950 |
9 | 354926 |
10 | 1360476 |
11 | 5231954 |
12 | 20177164 |
13 | 78004500 |
14 | 302211720 |
15 | 1173076245 |
16 | 4561139430 |
17 | 17761336230 |
18 | 69257611500 |
19 | 270391268070 |
20 | 1056823387620 |
[1,9,34,125,462,1722,6468,24453,92950,354926, 1360476,5231954,20177164,78004500,302211720, 1173076245,4561139430,17761336230,69257611500, 270391268070,1056823387620] |