A048709 Main diagonal of Family 1 "Rule 90 x Rule 150" array.
1, 27, 325, 7607, 69649, 1749419, 22103317, 476952263, 4311744769, 116417108763, 1392727114821, 32619053820599, 300171238899985, 7506480532757163, 94597931458646037, 2049660569696039367
Offset: 0
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