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| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 28 |
| 3 | 268 |
| 4 | 708 |
| 5 | 4766 |
| 6 | 15724 |
| 7 | 88434 |
| 8 | 331024 |
| 9 | 1683150 |
| 10 | 6777522 |
| 11 | 32549034 |
| 12 | 136712744 |
| 13 | 635507042 |
| 14 | 2735089882 |
| 15 | 12478735816 |
| 16 | 54465787400 |
| 17 | 245847114384 |
| 18 | 1081768683254 |
| 19 | 4852872926630 |
| 20 | 21453251299430 |
| 21 | 95899957070006 |
[16,28,268,708,4766,15724,88434,331024,1683150, 6777522,32549034,136712744,635507042,2735089882, 12478735816,54465787400,245847114384, 1081768683254,4852872926630,21453251299430, 95899957070006] |