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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 8 |
| 3 | 22 |
| 4 | 88 |
| 5 | 472 |
| 6 | 5588 |
| 7 | 10408 |
| 8 | 20648 |
| 9 | 34568 |
| 10 | 123076 |
| 11 | 1783976 |
| 12 | 3677228 |
| 13 | 4609418 |
| 14 | 4857688 |
| 15 | 6027208 |
| 16 | 9906578 |
| 17 | 16508152 |
| 18 | 19995308 |
| 19 | 20226572 |
| 20 | 32039062 |
| 21 | 56484004 |
| 22 | 88835528 |
| 23 | 97896692 |
| 24 | 135858088 |
| 25 | 354671468 |
| 26 | 1091638108 |
| 27 | 2260976428 |
| 28 | 3495804596 |
| 29 | 3723523516 |
| 30 | 5577624308 |
[4,8,22,88,472,5588,10408,20648,34568,123076, 1783976,3677228,4609418,4857688,6027208,9906578, 16508152,19995308,20226572,32039062,56484004, 88835528,97896692,135858088,354671468,1091638108, 2260976428,3495804596,3723523516,5577624308] |