188224

Appears in sequences

• Expansion of (1 - x)/(1 - 2*x - 2*x^2 + 2*x^3).at n=14A052528
• Number T(n,k) of endofunctions on [n] such that at most k elements with nonempty preimage have equal preimage cardinality and non-equinumerous preimages have cardinalities that differ by at least k; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=41A231915