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A021012 as a triangular array

1
1-1
2-42
6-1818-6
24-96144-9624
120-6001200-1200600-120
720-432010800-1440010800-4320720
5040-35280105840-176400176400-10584035280-5040
40320-3225601128960-22579202822400-22579201128960-32256040320
362880-3265920

A021012 as a square array

112624120720504040320362880
-1-4-18-96-600-4320-35280-322560-3265920
2181441200108001058401128960
-6-96-1200-14400-176400-2257920
24600108001764002822400
-120-4320-105840-2257920
720352801128960
-5040-322560
40320
112624120720504040320362880
-1-4-18-96-600-4320-35280-322560-3265920
2181441200108001058401128960
-6-96-1200-14400-176400-2257920
24600108001764002822400
-120-4320-105840-2257920
720352801128960
-5040-322560
40320