n | a(n) |
---|---|
0 | 2 |
1 | 7 |
2 | 25 |
3 | 90 |
4 | 325 |
5 | 1174 |
6 | 4241 |
7 | 15321 |
8 | 55349 |
9 | 199956 |
10 | 722370 |
11 | 2609667 |
12 | 9427803 |
13 | 34059315 |
14 | 123044249 |
15 | 444515318 |
16 | 1605876501 |
17 | 5801463374 |
18 | 20958633656 |
19 | 75716124779 |
20 | 273535557978 |
21 | 988187148996 |
22 | 3569970385786 |
23 | 12897039359739 |
24 | 46592438107869 |
25 | 168321986797406 |
[2,7,25,90,325,1174,4241,15321,55349,199956, 722370,2609667,9427803,34059315,123044249, 444515318,1605876501,5801463374,20958633656, 75716124779,273535557978,988187148996, 3569970385786,12897039359739,46592438107869, 168321986797406] |