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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 14 |
| 3 | 86 |
| 4 | 424 |
| 5 | 1926 |
| 6 | 8404 |
| 7 | 35836 |
| 8 | 150604 |
| 9 | 626726 |
| 10 | 2589844 |
| 11 | 10646676 |
| 12 | 43594464 |
| 13 | 177950236 |
| 14 | 724578824 |
| 15 | 2944375096 |
| 16 | 11944652884 |
| 17 | 48388816486 |
| 18 | 195794585044 |
| 19 | 791434666276 |
| 20 | 3196307541904 |
| 21 | 12898839944116 |
| 22 | 52019043912664 |
[1,14,86,424,1926,8404,35836,150604,626726, 2589844,10646676,43594464,177950236,724578824, 2944375096,11944652884,48388816486,195794585044, 791434666276,3196307541904,12898839944116, 52019043912664] |