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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 11 |
| 4 | 46 |
| 5 | 127 |
| 6 | 596 |
| 7 | 1717 |
| 8 | 7792 |
| 9 | 24806 |
| 10 | 108450 |
| 11 | 352717 |
| 12 | 1563914 |
| 13 | 5200301 |
| 14 | 22539046 |
| 15 | 77876117 |
| 16 | 331982444 |
| 17 | 1166803111 |
| 18 | 4945693769 |
| 19 | 17672631901 |
| 20 | 74053888812 |
| 21 | 269344740908 |
| 22 | 1118110015874 |
| 23 | 4116715363801 |
| 24 | 16984153623296 |
| 25 | 63205318063252 |
| 26 | 259049084680612 |
[1,4,11,46,127,596,1717,7792,24806,108450,352717, 1563914,5200301,22539046,77876117,331982444, 1166803111,4945693769,17672631901,74053888812, 269344740908,1118110015874,4116715363801, 16984153623296,63205318063252,259049084680612] |