18866

Appears in sequences

• Number of trimmed trees with n nodes.at n=19A002988
• G.f. A(x) defined by: A(x)^4 consists entirely of integer coefficients between 1 and 4 (A083954); A(x) is the unique power series solution with A(0)=1.at n=11A084204
• Number of rooted planar n-trees whose number of leaves is equal to 1 modulo 3.at n=11A119366
• Number of rooted planar n-trees whose number of leaves is equal to 2 modulo 3.at n=11A119367
• Maximal length of rook tour on an n X n+1 board.at n=29A152132
• Maximal length of rook tour on an n X n+3 board.at n=28A152134
• a(1) = 1; a(n+1) = Sum_{k=1..n} lcm(a(k),n)/n.at n=20A292303
• a(n) = a(n-1) + a(n-3) + a(n-4), where a(0) = 2, a(1) = 1, a(2) = 1, a(3) = 1.at n=22A295685
• Number of prime parts in the partitions of n into 8 parts.at n=43A309437
• Numbers that are the sum of six fourth powers in four or more ways.at n=36A345561
• Numbers that are the sum of six fourth powers in five or more ways.at n=2A345562
• Numbers that are the sum of six fourth powers in exactly five ways.at n=2A345817
• Number of compositions (ordered partitions) of n into at most 6 prime parts (counting 1 as a prime).at n=43A347761