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A123776 as a simple table

na(n)
15
228
3185
41287
59456
671167
7549076
84300975
934154107
10273998400
112217436152
1218074303774
13148232462372

[5,28,185,1287,9456,71167,549076,4300975,34154107,
 273998400,2217436152,18074303774,148232462372]