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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 16 |
| 2 | 224 |
| 3 | 2240 |
| 4 | 13632 |
| 5 | 58464 |
| 6 | 219520 |
| 7 | 930176 |
| 8 | 3805824 |
| 9 | 11930320 |
| 10 | 33558336 |
| 11 | 122352192 |
| 12 | 440858880 |
| 13 | 1176756448 |
| 14 | 3112368896 |
| 15 | 11008771200 |
| 16 | 35248366848 |
| 17 | 89371035936 |
| 18 | 232665100640 |
| 19 | 727171963840 |
| 20 | 2289378446208 |
| 21 | 5950875374080 |
| 22 | 13907284255872 |
| 23 | 43816224486528 |
[1,16,224,2240,13632,58464,219520,930176,3805824, 11930320,33558336,122352192,440858880,1176756448, 3112368896,11008771200,35248366848,89371035936, 232665100640,727171963840,2289378446208, 5950875374080,13907284255872,43816224486528] |