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A012292 as a simple table

na(n)
00
11
22
34
424
5180
61432
714544
8176064
92382800
1036330272
11618520384
1211562021504
13235623136320
145205288291712
15123834383495424
163155999144761344
1785799392788650240
182478387574846218752

[0,1,2,4,24,180,1432,14544,176064,2382800,
 36330272,618520384,11562021504,235623136320,
 5205288291712,123834383495424,3155999144761344,
 85799392788650240,2478387574846218752]