41821

Appears in sequences

• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, -1), (-1, 0, 1), (1, -1, -1), (1, 1, 1)}.at n=9A149523
• Number of binary strings of length n with no substrings equal to 000 or 011.at n=33A164315
• Expansion of x*(1+x+x^2) / ( (x-1)*(x^3+x^2-1) ).at n=33A171861
• Arises in the maximum number of C5's in a triangle-free graph.at n=42A185721
• Number of irreducible involutions of length n avoiding the pattern {123}.at n=16A278025
• a(n) is the total number of all winning moves for all partitions of n which represent Chomp positions.at n=37A284686