22906

Appears in sequences

• The number of trisubstitution products with composition C_n H_(2n-1) X_2 Y.at n=22A159940
• Number of binary strings of length n with equal numbers of 00101 and 01010 substrings.at n=15A164245
• a(n) = Sum_{p in P} binomial(H(2,p),2), where P is the set of partitions of n, and H(2,p) = number of hooks of size 2 in p.at n=29A301313
• Expansion of Product_{k>0} theta_3(q^(2*k))/theta_3(q^(2*k-1)), where theta_3() is the Jacobi theta function.at n=16A321027
• Length of cycles obtained by repeated application of the strip bijection for the triangular lattice (A367147), sorted by increasing minimum radius visited by any cycle of this length.at n=48A367149
• a(n) = Sum_{k=0..n} binomial(k+2,2) * binomial(k,2*(n-k)).at n=12A391963