n | a(n) |
---|---|
1 | 1 |
2 | 8 |
3 | 28 |
4 | 120 |
5 | 506 |
6 | 2240 |
7 | 9856 |
8 | 44562 |
9 | 199932 |
10 | 914676 |
11 | 4152696 |
12 | 19143782 |
13 | 87622590 |
14 | 406118090 |
15 | 1869888346 |
16 | 8701509206 |
17 | 40245967276 |
18 | 187867050760 |
19 | 872020225984 |
20 | 4080661245080 |
21 | 18995817588580 |
22 | 89071683414448 |
23 | 415623180115020 |
[1,8,28,120,506,2240,9856,44562,199932,914676, 4152696,19143782,87622590,406118090,1869888346, 8701509206,40245967276,187867050760,872020225984, 4080661245080,18995817588580,89071683414448, 415623180115020] |