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A270275 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 28 |
| 3 | 132 |
| 4 | 616 |
| 5 | 2576 |
| 6 | 10456 |
| 7 | 41792 |
| 8 | 166928 |
| 9 | 665688 |
| 10 | 2654168 |
| 11 | 10593728 |
| 12 | 42306328 |
| 13 | 169162608 |
| 14 | 676625416 |
| 15 | 2707754136 |
[1,4,28,132,616,2576,10456,41792,166928,665688, 2654168,10593728,42306328,169162608,676625416, 2707754136] |