1201837

Appears in sequences

• Number of binary strings of length n with no substrings equal to 0000 0011 or 0110.at n=22A164427
• Fill an infinite square array by following a spiral around the origin; in the central cell enter a(0)=1; thereafter, in the n-th cell, enter the sum of the entries of those earlier cells that can be seen from that cell.at n=24A280027