n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | 1 |
5 | 2 |
6 | 5 |
7 | 12 |
8 | 28 |
9 | 68 |
10 | 181 |
11 | 531 |
12 | 1671 |
13 | 5491 |
14 | 18627 |
15 | 65299 |
16 | 237880 |
17 | 903907 |
18 | 3580619 |
19 | 14729777 |
20 | 62639952 |
21 | 274442521 |
22 | 1236730244 |
23 | 5729809348 |
24 | 27292248240 |
25 | 133614280479 |
26 | 671803041553 |
27 | 3464970976743 |
28 | 18309428363425 |
29 | 99010800275743 |
30 | 547462187824465 |
31 | 3093329527120022 |
[1,0,1,1,1,2,5,12,28,68,181,531,1671,5491,18627, 65299,237880,903907,3580619,14729777,62639952, 274442521,1236730244,5729809348,27292248240, 133614280479,671803041553,3464970976743, 18309428363425,99010800275743,547462187824465, 3093329527120022] |