n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 4 |
5 | 14 |
6 | 46 |
7 | 140 |
8 | 412 |
9 | 1186 |
10 | 3354 |
11 | 9368 |
12 | 25920 |
13 | 71182 |
14 | 194322 |
15 | 527927 |
16 | 1428530 |
17 | 3852594 |
18 | 10360700 |
19 | 27795561 |
20 | 74414408 |
21 | 198862280 |
22 | 530590812 |
23 | 1413712094 |
24 | 3762056094 |
25 | 10000260036 |
26 | 26556402534 |
27 | 70459947925 |
28 | 186796151768 |
[0,0,0,1,4,14,46,140,412,1186,3354,9368,25920, 71182,194322,527927,1428530,3852594,10360700, 27795561,74414408,198862280,530590812,1413712094, 3762056094,10000260036,26556402534,70459947925, 186796151768] |