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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 32 |
| 3 | 108 |
| 4 | 500 |
| 5 | 1372 |
| 6 | 5324 |
| 7 | 13500 |
| 8 | 48668 |
| 9 | 119164 |
| 10 | 415292 |
| 11 | 1000188 |
| 12 | 3429500 |
| 13 | 8193532 |
| 14 | 27871484 |
| 15 | 66325500 |
| 16 | 224727548 |
| 17 | 533731324 |
| 18 | 1804870652 |
| 19 | 4282396668 |
| 20 | 14467221500 |
| 21 | 34309431292 |
| 22 | 115850907644 |
| 23 | 274676629500 |
| 24 | 927260024828 |
[4,32,108,500,1372,5324,13500,48668,119164,415292, 1000188,3429500,8193532,27871484,66325500, 224727548,533731324,1804870652,4282396668, 14467221500,34309431292,115850907644,274676629500, 927260024828] |