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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 4 |
| 3 | 12 |
| 4 | 28 |
| 5 | 76 |
| 6 | 164 |
| 7 | 732 |
| 8 | 1044 |
| 9 | 4924 |
| 10 | 6724 |
| 11 | 30636 |
| 12 | 43972 |
| 13 | 190516 |
| 14 | 313996 |
| 15 | 1197908 |
| 16 | 2284260 |
| 17 | 7678188 |
| 18 | 16257604 |
| 19 | 50524252 |
| 20 | 113052396 |
| 21 | 341811828 |
| 22 | 773714436 |
| 23 | 2358452388 |
| 24 | 5245994292 |
| 25 | 16447462492 |
| 26 | 35395532236 |
| 27 | 115129727188 |
| 28 | 238542983748 |
| 29 | 804980005276 |
[1,4,4,12,28,76,164,732,1044,4924,6724,30636, 43972,190516,313996,1197908,2284260,7678188, 16257604,50524252,113052396,341811828,773714436, 2358452388,5245994292,16447462492,35395532236, 115129727188,238542983748,804980005276] |