21264

Appears in sequences

• Specific heat for diamond.at n=5A002922
• Coordination sequence for hexagonal close-packing.at n=45A007899
• Expansion of (theta_3(z)*theta_3(5z)+theta_2(z)*theta_2(5z))^4.at n=34A028589
• a(1) = 1; a(n+1) = sum of terms in continued fraction for the sum of the continued fractions, [a(1); a(2), a(3),...,a(n-1),a(n)] and [a(n); a(n-1), a(n-2),...,a(2), a(1)].at n=19A058081
• Index of first occurrence of n-th prime in A001203, the continued fraction for Pi.at n=44A107892
• Expansion of phi(q^4) / phi(q) in powers of q where phi() is a Ramanujan theta function.at n=22A112128
• a(n) is the number of binary strings of length n such that no subsequence of length 4 contains 3 or more ones.at n=17A118647
• Expansion of (phi(q^2) / phi(-q))^2 in powers of q where phi() is a Ramanujan theta function.at n=11A131126
• Number of strings of numbers x(i=1..n) in 0..2 with sum i*x(i) equal to n*2.at n=24A184696
• Expansion of phi(q^4) / phi(-q) in powers of q where phi() is a Ramanujan theta function.at n=22A208933
• Expansion of q * phi(q) * psi(q^8) / (phi(-q) * phi(q^4)) in powers of q where phi(), psi() are Ramanujan theta functions.at n=21A215348
• Number of (n+1) X (n+1) 0..5 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).at n=3A235090
• Number of (n+1) X (4+1) 0..5 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).at n=3A235094
• T(n,k) is the number of (n+1) X (k+1) 0..5 arrays with every 2 X 2 subblock having its diagonal sum differing from its antidiagonal sum by 4, with no adjacent elements equal (constant-stress tilted 1 X 1 tilings).at n=24A235098
• Number of semistandard rectangular plane partitions of n.at n=33A323432