n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 14 |
5 | 42 |
6 | 138 |
7 | 466 |
8 | 1643 |
9 | 5919 |
10 | 21773 |
11 | 81279 |
12 | 307483 |
13 | 1175352 |
14 | 4534161 |
15 | 17626999 |
16 | 68992703 |
17 | 271641249 |
18 | 1075144364 |
19 | 4275274867 |
20 | 17071822275 |
21 | 68428152475 |
22 | 275217386092 |
23 | 1110375948303 |
24 | 4492641333003 |
25 | 18225081419544 |
26 | 74111194585752 |
27 | 302040709982249 |
[0,1,2,5,14,42,138,466,1643,5919,21773,81279, 307483,1175352,4534161,17626999,68992703, 271641249,1075144364,4275274867,17071822275, 68428152475,275217386092,1110375948303, 4492641333003,18225081419544,74111194585752, 302040709982249] |