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A186913 as a simple table

na(n)
144902749582723
213921822487031205
32169936652932512523
4219019175194540430058
515954040054059557650482
6893383694291331850798966
740128119810449322920431346
81491377073810394581396929600

[44902749582723,13921822487031205,
 2169936652932512523,219019175194540430058,
 15954040054059557650482,893383694291331850798966,
 40128119810449322920431346,
 1491377073810394581396929600]