157340

Appears in sequences

• Number of cyclic Steiner triple systems of order 2n+1.at n=24A002885
• Number of point labeled reduced 5-free two-graphs with n nodes.at n=8A007834
• (n,3,1) difference families over Z_n.at n=42A011991
• Centered 1729-gonal numbers.at n=13A130876
• 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, 1, 1), (0, 0, 1), (1, 0, -1), (1, 1, 0)}.at n=9A150487
• Number of (n+2) X (3+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000101 or 00000111.at n=13A261706
• G.f.: Product_{k>=1, j>=1} ((1 + x^(k*j)) / (1 - x^(k*j)))^2.at n=12A320237