n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 13 |
3 | 45 |
4 | 161 |
5 | 588 |
6 | 2178 |
7 | 8151 |
8 | 30745 |
9 | 116688 |
10 | 445094 |
11 | 1704794 |
12 | 6552378 |
13 | 25258600 |
14 | 97617060 |
15 | 378098955 |
16 | 1467343305 |
17 | 5704370760 |
18 | 22210199550 |
19 | 86595896310 |
20 | 338052201630 |
21 | 1321178419080 |
22 | 5168764845660 |
23 | 20240517205350 |
[1,4,13,45,161,588,2178,8151,30745,116688,445094, 1704794,6552378,25258600,97617060,378098955, 1467343305,5704370760,22210199550,86595896310, 338052201630,1321178419080,5168764845660, 20240517205350] |