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A186784 as a simple table

na(n)
1580
211354
363504
4739334
58499038
697501656
71029483706
811412065338
9126395136040
101397513210452
1115414550870912
12170592128024378
131886912171155070
1420866267731905124
15230752006350156298

[580,11354,63504,739334,8499038,97501656,
 1029483706,11412065338,126395136040,1397513210452,
 15414550870912,170592128024378,1886912171155070,
 20866267731905124,230752006350156298]