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| n | a(n) |
|---|---|
| 1 | 2184 |
| 2 | 6048 |
| 3 | 14760 |
| 4 | 45792 |
| 5 | 127032 |
| 6 | 423072 |
| 7 | 1283880 |
| 8 | 4481376 |
| 9 | 14469624 |
| 10 | 52195488 |
| 11 | 176064360 |
| 12 | 650582112 |
| 13 | 2265751992 |
| 14 | 8525288352 |
| 15 | 30415487400 |
| 16 | 116039804256 |
| 17 | 421792852344 |
| 18 | 1626492482208 |
| 19 | 5999520374760 |
| 20 | 23327294132832 |
| 21 | 87053575664952 |
[2184,6048,14760,45792,127032,423072,1283880, 4481376,14469624,52195488,176064360,650582112, 2265751992,8525288352,30415487400,116039804256, 421792852344,1626492482208,5999520374760, 23327294132832,87053575664952] |