217416domain: NAppears in sequencesAbsolute row sums of triangle A104967.at n=31A104968Number of binary strings of length n with equal numbers of 00001 and 11010 substrings.at n=19A164209Number of (n+1) X (n+1) -2..2 symmetric matrices with every 2 X 2 subblock having sum zero and two, three or four distinct values.at n=11A211117