118663

Appears in sequences

• Number of 4-ary rooted trees with n nodes and height exactly 5.at n=19A036629
• Graham-Pollak sequence with initial term 5.at n=29A091522
• First differences of A000166.at n=8A105926
• G.f. A(x) satisfies A(x) = 1 + x/sqrt(1-4*x^2) * A(x/sqrt(1-4*x^2)).at n=12A201169
• Number of nonnegative integer matrices with 2 distinct columns and any number of distinct nonzero rows with each column sum being n and rows in decreasing lexicographic order.at n=13A331317
• Square array read by antidiagonals downwards: for n >= 2, T(k,n) is the number of permutations of [k+n] that differ in every position from both the identity permutation and a permutation consisting of k 1-cycles and one n-cycle.at n=53A335391