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A222968 as a simple table

na(n)
154
2534
328836
4487830
526342820
6677339136
741972251734
81306606331404
982298403509112
103041055175823616
11191470088044451700

[54,534,28836,487830,26342820,677339136,
 41972251734,1306606331404,82298403509112,
 3041055175823616,191470088044451700]