161420

Appears in sequences

• Number of permutations of 0..(n-1) with equal numbers of bit changes for every bit in the binary representation of the permutation.at n=10A190389
• G.f. satisfies: A(x) = x^3 - x + Series_Reversion(x - x*A(x)).at n=14A212919
• Regular triangle where T(n,k) is the number of pairs of set partitions of {1,...,n} with meet of length k.at n=25A318391