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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 36 |
| 3 | 37 |
| 4 | 104 |
| 5 | 275 |
| 6 | 753 |
| 7 | 2049 |
| 8 | 5602 |
| 9 | 15305 |
| 10 | 41866 |
| 11 | 114475 |
| 12 | 313122 |
| 13 | 856462 |
| 14 | 2342559 |
| 15 | 6407780 |
| 16 | 17526908 |
| 17 | 47941766 |
| 18 | 131135884 |
| 19 | 358697083 |
| 20 | 981151642 |
| 21 | 2683758871 |
| 22 | 7340930445 |
| 23 | 20079778989 |
| 24 | 54924550811 |
| 25 | 150236085835 |
| 26 | 410943350656 |
[4,36,37,104,275,753,2049,5602,15305,41866,114475, 313122,856462,2342559,6407780,17526908,47941766, 131135884,358697083,981151642,2683758871, 7340930445,20079778989,54924550811,150236085835, 410943350656] |