n | a(n) |
---|---|
2 | 1 |
3 | 1 |
4 | 7 |
5 | 18 |
6 | 59 |
7 | 193 |
8 | 616 |
9 | 1955 |
10 | 6244 |
11 | 19926 |
12 | 63490 |
13 | 202068 |
14 | 642816 |
15 | 2044571 |
16 | 6502193 |
17 | 20673020 |
18 | 65714586 |
19 | 208870774 |
20 | 663868055 |
21 | 2109997964 |
22 | 6706282384 |
23 | 21315049217 |
24 | 67748772174 |
25 | 215343287489 |
26 | 684507346839 |
27 | 2175916952697 |
28 | 6917096914771 |
29 | 21989855308501 |
[1,1,7,18,59,193,616,1955,6244,19926,63490,202068, 642816,2044571,6502193,20673020,65714586, 208870774,663868055,2109997964,6706282384, 21315049217,67748772174,215343287489,684507346839, 2175916952697,6917096914771,21989855308501] |