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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 44 |
| 2 | 946 |
| 3 | 13244 |
| 4 | 135751 |
| 5 | 1086008 |
| 6 | 7059052 |
| 7 | 38320568 |
| 8 | 177232627 |
| 9 | 708930508 |
| 10 | 2481256778 |
| 11 | 7669339132 |
| 12 | 21090682613 |
| 13 | 51915526432 |
| 14 | 114955808528 |
| 15 | 229911617056 |
| 16 | 416714805914 |
| 17 | 686353797976 |
| 18 | 1029530696964 |
| 19 | 1408831480056 |
| 20 | 1761039350070 |
| 21 | 2012616400080 |
[1,44,946,13244,135751,1086008,7059052,38320568, 177232627,708930508,2481256778,7669339132, 21090682613,51915526432,114955808528,229911617056, 416714805914,686353797976,1029530696964, 1408831480056,1761039350070,2012616400080] |