n | a(n) |
---|---|
1 | 0 |
2 | 3 |
3 | 56 |
4 | 332 |
5 | 1578 |
6 | 6540 |
7 | 24490 |
8 | 86010 |
9 | 288426 |
10 | 933792 |
11 | 2940425 |
12 | 9053479 |
13 | 27364145 |
14 | 81436340 |
15 | 239191322 |
16 | 694661663 |
17 | 1997809427 |
18 | 5696648777 |
19 | 16121608346 |
20 | 45319683250 |
21 | 126637762818 |
22 | 351964959409 |
23 | 973463999825 |
24 | 2680515593254 |
[0,3,56,332,1578,6540,24490,86010,288426,933792, 2940425,9053479,27364145,81436340,239191322, 694661663,1997809427,5696648777,16121608346, 45319683250,126637762818,351964959409, 973463999825,2680515593254] |