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A291264 as a simple table
| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 12 |
| 2 | 36 |
| 3 | 104 |
| 4 | 292 |
| 5 | 804 |
| 6 | 2180 |
| 7 | 5840 |
| 8 | 15492 |
| 9 | 40764 |
| 10 | 106532 |
| 11 | 276792 |
| 12 | 715556 |
| 13 | 1841748 |
| 14 | 4722180 |
| 15 | 12066208 |
| 16 | 30737924 |
| 17 | 78088812 |
| 18 | 197892388 |
| 19 | 500374024 |
| 20 | 1262618148 |
| 21 | 3180066180 |
| 22 | 7995639940 |
| 23 | 20071580784 |
| 24 | 50312160388 |
| 25 | 125942854044 |
| 26 | 314865132324 |
| 27 | 786254598872 |
[4,12,36,104,292,804,2180,5840,15492,40764,106532, 276792,715556,1841748,4722180,12066208,30737924, 78088812,197892388,500374024,1262618148, 3180066180,7995639940,20071580784,50312160388, 125942854044,314865132324,786254598872] |