66865

Appears in sequences

• Number of binary strings of length n with no substrings equal to 0001 or 0010.at n=19A164392
• Number of (n+1)X(n+1) -9..9 symmetric matrices with every 2X2 subblock having sum zero and one, two or three distinct values.at n=7A211553
• Number of solutions to rev(x^2) = rev(x)^2 with at most n digits, where the function rev(x) reverses the digits of x.at n=12A225301
• Number of 5-cycles in the n-polygon diagonal intersection graph.at n=40A300553