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A119692 as a simple table
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 2 |
| 2 | 6 |
| 3 | 40 |
| 4 | 210 |
| 5 | 1260 |
| 6 | 7392 |
| 7 | 44616 |
| 8 | 270270 |
| 9 | 1653080 |
| 10 | 10161580 |
| 11 | 62783448 |
| 12 | 389398464 |
| 13 | 2423339800 |
| 14 | 15123958200 |
| 15 | 94621687200 |
| 16 | 593266344930 |
| 17 | 3726769133340 |
| 18 | 23450149615200 |
| 19 | 147778547947800 |
| 20 | 932531767467300 |
| 21 | 5891770693620240 |
| 22 | 37265696746444920 |
| 23 | 235945424360833200 |
[0,2,6,40,210,1260,7392,44616,270270,1653080, 10161580,62783448,389398464,2423339800, 15123958200,94621687200,593266344930, 3726769133340,23450149615200,147778547947800, 932531767467300,5891770693620240, 37265696746444920,235945424360833200] |