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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 14 |
| 5 | 40 |
| 6 | 180 |
| 7 | 616 |
| 8 | 2456 |
| 9 | 8960 |
| 10 | 34384 |
| 11 | 128160 |
| 12 | 485728 |
| 13 | 1823360 |
| 14 | 6882368 |
| 15 | 25896064 |
| 16 | 97614720 |
| 17 | 367575040 |
| 18 | 1384954112 |
| 19 | 5216465408 |
| 20 | 19651804672 |
| 21 | 74025216000 |
| 22 | 278859191296 |
| 23 | 1050447030272 |
| 24 | 3957059508224 |
| 25 | 14906157629440 |
| 26 | 56151566438400 |
[0,1,2,14,40,180,616,2456,8960,34384,128160, 485728,1823360,6882368,25896064,97614720, 367575040,1384954112,5216465408,19651804672, 74025216000,278859191296,1050447030272, 3957059508224,14906157629440,56151566438400] |