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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 32 |
| 3 | 60 |
| 4 | 120 |
| 5 | 252 |
| 6 | 496 |
| 7 | 972 |
| 8 | 1960 |
| 9 | 3980 |
| 10 | 7872 |
| 11 | 15676 |
| 12 | 31512 |
| 13 | 63260 |
| 14 | 125840 |
| 15 | 251692 |
| 16 | 504456 |
| 17 | 1009452 |
| 18 | 2014560 |
| 19 | 4031900 |
| 20 | 8069112 |
| 21 | 16136636 |
| 22 | 32249392 |
| 23 | 64530060 |
| 24 | 129075560 |
| 25 | 258121932 |
| 26 | 516130816 |
| 27 | 1032513532 |
| 28 | 2064979160 |
| 29 | 4129750620 |
[16,32,60,120,252,496,972,1960,3980,7872,15676, 31512,63260,125840,251692,504456,1009452,2014560, 4031900,8069112,16136636,32249392,64530060, 129075560,258121932,516130816,1032513532, 2064979160,4129750620] |