39550

Appears in sequences

• Square chains: the number of permutations (reversals not counted as different) of the numbers 1 to n such that the sum of any two consecutive numbers is a square.at n=25A071983
• Number of 6-line partitions of n (i.e., planar partitions of n with at most 6 lines).at n=19A225196
• Regular triangle where T(n,k) is the number of pairs of set partitions of {1,...,n} with meet of length k.at n=24A318391