n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 14 |
4 | 51 |
5 | 188 |
6 | 702 |
7 | 2644 |
8 | 10026 |
9 | 38223 |
10 | 146359 |
11 | 562456 |
12 | 2168134 |
13 | 8379539 |
14 | 32459199 |
15 | 125984039 |
16 | 489837300 |
17 | 1907490728 |
18 | 7438346255 |
19 | 29042470132 |
20 | 113522618066 |
21 | 444199913556 |
22 | 1739735079466 |
23 | 6819657196928 |
24 | 26753893533257 |
25 | 105034060120469 |
26 | 412637434996367 |
[1,1,4,14,51,188,702,2644,10026,38223,146359, 562456,2168134,8379539,32459199,125984039, 489837300,1907490728,7438346255,29042470132, 113522618066,444199913556,1739735079466, 6819657196928,26753893533257,105034060120469, 412637434996367] |