109951162777domain: NAppears in sequencesBase 4 digits are, in order, the first n terms of the periodic sequence with initial period 1,2.at n=19A037481a(n) = 3*a(n-1) + 4*a(n-2), a(0)=a(1)=1.at n=19A102900List of numbers of the forms (2^(4m+3)-3)/5 and (2^(12m+4)-3)/13 arranged in increasing order.at n=13A260953