n | a(n) |
---|---|
18 | 4 |
19 | 30 |
20 | 184 |
21 | 894 |
22 | 3885 |
23 | 15386 |
24 | 56956 |
25 | 199620 |
26 | 669702 |
27 | 2166462 |
28 | 6798186 |
29 | 20786496 |
30 | 62160079 |
31 | 182336358 |
32 | 525931258 |
33 | 1494726848 |
34 | 4192885357 |
35 | 11625457180 |
36 | 31899800729 |
37 | 86717361496 |
38 | 233754981005 |
39 | 625311996048 |
[4,30,184,894,3885,15386,56956,199620,669702, 2166462,6798186,20786496,62160079,182336358, 525931258,1494726848,4192885357,11625457180, 31899800729,86717361496,233754981005,625311996048] |