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| n | a(n) |
|---|---|
| 1 | 68 |
| 2 | 290 |
| 3 | 1412 |
| 4 | 5708 |
| 5 | 25832 |
| 6 | 103538 |
| 7 | 447332 |
| 8 | 1790084 |
| 9 | 7524728 |
| 10 | 30101684 |
| 11 | 124437224 |
| 12 | 497759192 |
| 13 | 2036030288 |
| 14 | 8144159762 |
| 15 | 33083125028 |
| 16 | 132332645972 |
| 17 | 535071925208 |
| 18 | 2140288255100 |
| 19 | 8626608745592 |
| 20 | 34506437098664 |
| 21 | 138775530904496 |
[68,290,1412,5708,25832,103538,447332,1790084, 7524728,30101684,124437224,497759192,2036030288, 8144159762,33083125028,132332645972,535071925208, 2140288255100,8626608745592,34506437098664, 138775530904496] |