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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 256 |
| 3 | 912 |
| 4 | 3130 |
| 5 | 11950 |
| 6 | 43264 |
| 7 | 157472 |
| 8 | 597090 |
| 9 | 2313118 |
| 10 | 9090370 |
| 11 | 36238920 |
| 12 | 145935334 |
| 13 | 591509888 |
| 14 | 2409192758 |
| 15 | 9847302712 |
| 16 | 40346159978 |
| 17 | 165583978038 |
| 18 | 680396239866 |
| 19 | 2798171356888 |
| 20 | 11514485951718 |
| 21 | 47402210703538 |
[16,256,912,3130,11950,43264,157472,597090, 2313118,9090370,36238920,145935334,591509888, 2409192758,9847302712,40346159978,165583978038, 680396239866,2798171356888,11514485951718, 47402210703538] |