n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 17 |
4 | 74 |
5 | 326 |
6 | 1446 |
7 | 6441 |
8 | 28770 |
9 | 128750 |
10 | 576944 |
11 | 2587850 |
12 | 11615932 |
13 | 52167688 |
14 | 234383146 |
15 | 1053386937 |
16 | 4735393794 |
17 | 21291593238 |
18 | 95747347176 |
19 | 430624242942 |
20 | 1936925461644 |
21 | 8712882517188 |
22 | 39195738193836 |
23 | 176335080590442 |
24 | 793336332850164 |
25 | 3569368545752076 |
[1,1,4,17,74,326,1446,6441,28770,128750,576944, 2587850,11615932,52167688,234383146,1053386937, 4735393794,21291593238,95747347176,430624242942, 1936925461644,8712882517188,39195738193836, 176335080590442,793336332850164,3569368545752076] |