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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 30 |
| 4 | 124 |
| 5 | 526 |
| 6 | 2293 |
| 7 | 10151 |
| 8 | 45611 |
| 9 | 207164 |
| 10 | 948963 |
| 11 | 4379129 |
| 12 | 20334454 |
| 13 | 94910832 |
| 14 | 445014609 |
| 15 | 2094881198 |
| 16 | 9896041051 |
| 17 | 46892548781 |
| 18 | 222820230769 |
| 19 | 1061429069122 |
| 20 | 5067647230070 |
| 21 | 24244574605490 |
| 22 | 116208774713007 |
| 23 | 557969923616332 |
| 24 | 2683310444822610 |
| 25 | 12923126174542911 |
| 26 | 62323796793505182 |
[1,2,8,30,124,526,2293,10151,45611,207164,948963, 4379129,20334454,94910832,445014609,2094881198, 9896041051,46892548781,222820230769,1061429069122, 5067647230070,24244574605490,116208774713007, 557969923616332,2683310444822610, 12923126174542911,62323796793505182] |