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A020524 as a simple table

na(n)
00
12
2132
33080
457360
5983072
616252992
7264241280
84261413120
968451041792
101097364145152
1117575006177280
12281337537761280
134502500115750912
1472048797944922112
151152851135862702080
1618446181123756195840
17295143401579725586432
184722330454072626511872

[0,2,132,3080,57360,983072,16252992,264241280,
 4261413120,68451041792,1097364145152,
 17575006177280,281337537761280,4502500115750912,
 72048797944922112,1152851135862702080,
 18446181123756195840,295143401579725586432,
 4722330454072626511872]