n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 10 |
3 | 26 |
4 | 68 |
5 | 178 |
6 | 466 |
7 | 1220 |
8 | 3194 |
9 | 8362 |
10 | 21892 |
11 | 57314 |
12 | 150050 |
13 | 392836 |
14 | 1028458 |
15 | 2692538 |
16 | 7049156 |
17 | 18454930 |
18 | 48315634 |
19 | 126491972 |
20 | 331160282 |
21 | 866988874 |
22 | 2269806340 |
23 | 5942430146 |
24 | 15557484098 |
25 | 40730022148 |
26 | 106632582346 |
27 | 279167724890 |
28 | 730870592324 |
[1,4,10,26,68,178,466,1220,3194,8362,21892,57314, 150050,392836,1028458,2692538,7049156,18454930, 48315634,126491972,331160282,866988874,2269806340, 5942430146,15557484098,40730022148,106632582346, 279167724890,730870592324] |