n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 12 |
4 | 46 |
5 | 174 |
6 | 703 |
7 | 2888 |
8 | 12148 |
9 | 51924 |
10 | 224551 |
11 | 982451 |
12 | 4331352 |
13 | 19247666 |
14 | 86027816 |
15 | 386632310 |
16 | 1745493623 |
17 | 7912474214 |
18 | 35995573003 |
19 | 164273095721 |
20 | 751821506551 |
21 | 3449621370468 |
22 | 15864629611684 |
23 | 73113526659709 |
24 | 337594692984764 |
25 | 1561539606796564 |
26 | 7234504448723448 |
27 | 33566690644670128 |
[1,1,4,12,46,174,703,2888,12148,51924,224551, 982451,4331352,19247666,86027816,386632310, 1745493623,7912474214,35995573003,164273095721, 751821506551,3449621370468,15864629611684, 73113526659709,337594692984764,1561539606796564, 7234504448723448,33566690644670128] |