18392

Appears in sequences

• Coordination sequence for 4-dimensional cubic lattice (points on surface of 4-dimensional cross-polytope).at n=19A008412
• a(n) = floor(Pi^n mod n^Pi).at n=33A066434
• Number of 5k+3 primes (A030431) in range ]2^n,2^(n+1)].at n=19A095023
• a(n) = Sum_{k=0..floor(n/4)} C(n-2k,2k) * 3^k * 2^(n-4k).at n=11A100133
• Number of 4-step self-avoiding walks on an n X n square summed over all starting positions.at n=23A188149
• Number of all polyhedra (tetrahedra of any orientation and octahedra) of any size, formed when intersecting a regular tetrahedron by planes parallel to its sides and dividing its edges into n equal parts.at n=20A216175
• Numbers m such that the GCD of the x's that satisfy sigma(x) = m is 3.at n=30A241648
• Square roots of A244506.at n=6A244507
• Numbers that are values of the totient function (A002202) but not of the reduced totient function (A002174).at n=7A270265
• Expansion of 1/(1 - x*Product_{k>=1} (1 + x^k)).at n=14A299106
• Product_{n>=1} (1 + x^n)^a(n) = g.f. of A001970 (partitions of partitions).at n=35A305841
• E.g.f.: Product_{k>=1} (1 + x^k)^(cos(x)/k).at n=9A347899
• Number of graph minors of the n-centipede graph.at n=8A352102
• a(n) = 4*(23 - 17*n + 8*n^2).at n=24A387458