19351

Appears in sequences

• Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1111-0100-0100 pattern in any orientation.at n=13A147468
• Number of arrays of median of three adjacent elements of some length 6 0..n array, with no adjacent equal elements in the latter.at n=11A229014
• Number of integer partitions of n that have an even number of parts and cannot be partitioned into distinct pairs of distinct parts, i.e., that are not the multiset union of any set of edges.at n=43A339559
• 31-gonal numbers: a(n) = n*(29*n-27)/2.at n=37A360488