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A006659 as a simple table

na(n)
12
212
356
4240
5990
64004
716016
863648
9251940
10994840
113922512
1215452320
1360843510
14239519700
15942871200
163711935040
1714615744220
1857562286760
19226760523600
20893550621600
213522078700140
2213887053160552

[2,12,56,240,990,4004,16016,63648,251940,994840,
 3922512,15452320,60843510,239519700,942871200,
 3711935040,14615744220,57562286760,226760523600,
 893550621600,3522078700140,13887053160552]