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A277474 as a simple table
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 0 |
| 3 | 6 |
| 4 | 36 |
| 5 | 380 |
| 6 | 4830 |
| 7 | 74382 |
| 8 | 1342712 |
| 9 | 27825912 |
| 10 | 651274650 |
| 11 | 16994464850 |
| 12 | 489240628932 |
| 13 | 15404364096420 |
| 14 | 526634857318934 |
| 15 | 19428038813967630 |
| 16 | 769280055136105200 |
| 17 | 32543192449030871792 |
| 18 | 1464827827285673677746 |
| 19 | 69903432558329996409642 |
| 20 | 3525344776953738276010940 |
[0,1,0,6,36,380,4830,74382,1342712,27825912, 651274650,16994464850,489240628932,15404364096420, 526634857318934,19428038813967630, 769280055136105200,32543192449030871792, 1464827827285673677746,69903432558329996409642, 3525344776953738276010940] |