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| n | a(n) |
|---|---|
| 1 | 4356 |
| 2 | 8320 |
| 3 | 18616 |
| 4 | 59944 |
| 5 | 149828 |
| 6 | 441004 |
| 7 | 1091308 |
| 8 | 3629540 |
| 9 | 9151956 |
| 10 | 29663392 |
| 11 | 74544872 |
| 12 | 255953372 |
| 13 | 646804184 |
| 14 | 2216610520 |
| 15 | 5586633244 |
| 16 | 19681657576 |
| 17 | 49743175552 |
| 18 | 176195058308 |
| 19 | 444048959908 |
| 20 | 1593418221824 |
| 21 | 4026932301548 |
[4356,8320,18616,59944,149828,441004,1091308, 3629540,9151956,29663392,74544872,255953372, 646804184,2216610520,5586633244,19681657576, 49743175552,176195058308,444048959908, 1593418221824,4026932301548] |