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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 10 |
| 4 | 46 |
| 5 | 139 |
| 6 | 667 |
| 7 | 2269 |
| 8 | 11056 |
| 9 | 40420 |
| 10 | 198622 |
| 11 | 761287 |
| 12 | 3761083 |
| 13 | 14905342 |
| 14 | 73897519 |
| 15 | 300239101 |
| 16 | 1492016545 |
| 17 | 6179650609 |
| 18 | 30758939461 |
| 19 | 129359690452 |
| 20 | 644617200640 |
| 21 | 2744877878209 |
| 22 | 13689374276287 |
| 23 | 58893801473479 |
| 24 | 293895276529510 |
| 25 | 1275360122843992 |
| 26 | 6367237075041664 |
| 27 | 27834937991979418 |
[1,1,4,10,46,139,667,2269,11056,40420,198622, 761287,3761083,14905342,73897519,300239101, 1492016545,6179650609,30758939461,129359690452, 644617200640,2744877878209,13689374276287, 58893801473479,293895276529510,1275360122843992, 6367237075041664,27834937991979418] |