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A281778 as a simple table
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 24 |
| 5 | 900 |
| 6 | 18030 |
| 7 | 276570 |
| 8 | 3680964 |
| 9 | 45065160 |
| 10 | 523292010 |
| 11 | 5859909990 |
| 12 | 63862084704 |
| 13 | 680829769620 |
| 14 | 7122705252390 |
| 15 | 73284607133010 |
| 16 | 742843170653244 |
| 17 | 7429450873589280 |
| 18 | 73416173732059170 |
| 19 | 717721593866613630 |
| 20 | 6949589106333898584 |
| 21 | 66721599431782204140 |
[0,0,0,0,24,900,18030,276570,3680964,45065160, 523292010,5859909990,63862084704,680829769620, 7122705252390,73284607133010,742843170653244, 7429450873589280,73416173732059170, 717721593866613630,6949589106333898584, 66721599431782204140] |