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A147890 as a simple table

na(n)
11
22
36
424
596
6444
73172
816976
9112790
10839320
117525858
1286947336
13816752748
148170308628
1590956874778
161199823762964

[1,2,6,24,96,444,3172,16976,112790,839320,7525858,
 86947336,816752748,8170308628,90956874778,
 1199823762964]