n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 12 |
4 | 40 |
5 | 151 |
6 | 573 |
7 | 2233 |
8 | 9134 |
9 | 37319 |
10 | 156741 |
11 | 667054 |
12 | 2860003 |
13 | 12451013 |
14 | 54546675 |
15 | 240872936 |
16 | 1072716219 |
17 | 4799044185 |
18 | 21612759421 |
19 | 97809065210 |
20 | 444495198056 |
21 | 2029640845007 |
22 | 9299375495917 |
23 | 42763721937159 |
24 | 197309308044494 |
25 | 912930646489117 |
26 | 4236548432117128 |
27 | 19709480208088418 |
[1,1,4,12,40,151,573,2233,9134,37319,156741, 667054,2860003,12451013,54546675,240872936, 1072716219,4799044185,21612759421,97809065210, 444495198056,2029640845007,9299375495917, 42763721937159,197309308044494,912930646489117, 4236548432117128,19709480208088418] |