n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 13 |
3 | 40 |
4 | 119 |
5 | 350 |
6 | 1022 |
7 | 2973 |
8 | 8635 |
9 | 25074 |
10 | 72850 |
11 | 211875 |
12 | 616985 |
13 | 1799092 |
14 | 5253127 |
15 | 15358500 |
16 | 44958889 |
17 | 131759776 |
18 | 386557548 |
19 | 1135204289 |
20 | 3336791503 |
21 | 9816315842 |
22 | 28900431835 |
23 | 85147344488 |
24 | 251030187583 |
25 | 740539502786 |
[1,4,13,40,119,350,1022,2973,8635,25074,72850, 211875,616985,1799092,5253127,15358500,44958889, 131759776,386557548,1135204289,3336791503, 9816315842,28900431835,85147344488,251030187583, 740539502786] |