n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 7 |
3 | 20 |
4 | 54 |
5 | 143 |
6 | 376 |
7 | 986 |
8 | 2583 |
9 | 6764 |
10 | 17710 |
11 | 46367 |
12 | 121392 |
13 | 317810 |
14 | 832039 |
15 | 2178308 |
16 | 5702886 |
17 | 14930351 |
18 | 39088168 |
19 | 102334154 |
20 | 267914295 |
21 | 701408732 |
22 | 1836311902 |
23 | 4807526975 |
24 | 12586269024 |
25 | 32951280098 |
26 | 86267571271 |
27 | 225851433716 |
[0,2,7,20,54,143,376,986,2583,6764,17710,46367, 121392,317810,832039,2178308,5702886,14930351, 39088168,102334154,267914295,701408732,1836311902, 4807526975,12586269024,32951280098,86267571271, 225851433716] |