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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 11 |
| 4 | 48 |
| 5 | 160 |
| 6 | 736 |
| 7 | 2661 |
| 8 | 12446 |
| 9 | 47969 |
| 10 | 227591 |
| 11 | 907792 |
| 12 | 4352482 |
| 13 | 17757644 |
| 14 | 85648585 |
| 15 | 356525315 |
| 16 | 1728298464 |
| 17 | 7296649603 |
| 18 | 35514264747 |
| 19 | 151581065164 |
| 20 | 739817165935 |
| 21 | 3189149570845 |
| 22 | 15602739456306 |
| 23 | 67789083839402 |
| 24 | 332328271392838 |
| 25 | 1453327449959479 |
| 26 | 7135823916839902 |
| 27 | 31393615362554965 |
[1,1,4,11,48,160,736,2661,12446,47969,227591, 907792,4352482,17757644,85648585,356525315, 1728298464,7296649603,35514264747,151581065164, 739817165935,3189149570845,15602739456306, 67789083839402,332328271392838,1453327449959479, 7135823916839902,31393615362554965] |