50559

Appears in sequences

• Expansion of (1-x)/((1-2x)(1+x-x^2)).at n=17A052964
• Number of walks of length 2n between two nodes at distance 4 in the cycle graph C_10.at n=7A095931
• Number of imprimitive (periodic) bracelets (or necklaces) with n red or blue beads such that the beads switch colors when bracelet is turned over.at n=41A115121
• a(n) = Sum_{k>=0} binomial(n,5*k+1).at n=18A133476
• a(n) = Sum_{k>=0} binomial(n,5*k+2).at n=18A139714
• sum_{k=floor[(n+5)/2] mod 5} C(n,k).at n=18A173126
• Numbers n such that A045876(n) = A045876(n+1).at n=12A276758
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 113", based on the 5-celled von Neumann neighborhood.at n=15A278906
• Number of integer partitions of n whose multiplicities cover an initial interval of positive integers.at n=50A317081
• a(n) = (1/phi(n)) * Sum_{j=1..n} Sum_{k=1..n} phi(n*j*k).at n=24A372668
• a(n) = Sum_{k=0..n} binomial(5*n+3,5*k+1).at n=3A387812