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A001942 as a simple table

na(n)
01
10
2-196560
3-16773120
438237799600
56589219553280
6-7156481189457600
7-1928958160910376960
81281020641484922702000
9496393397255370269491200
10-216626064507656630386166880
11-118257112035536800684700160000

[1,0,-196560,-16773120,38237799600,6589219553280,
 -7156481189457600,-1928958160910376960,
 1281020641484922702000,496393397255370269491200,
 -216626064507656630386166880,
 -118257112035536800684700160000]