266085

Appears in sequences

• Bending a piece of wire of length n+1 (configurations that can only be brought into coincidence by turning the figure over are counted as different).at n=12A001444
• a(n) = 3^n*(3^n + 1)/2.at n=6A025551
• Number of reversible strings with n beads of 3 colors.at n=12A032120
• a(n) = n^2*(n^2 + 1)/2.at n=27A037270
• Triangle T(n,k) of numbers of proper k-covers of an unlabeled n-set, k=1..2^n-2.at n=31A055127
• a(n) = (n^6 + n^3)/2.at n=9A071232
• a(n) = (n^12 + n^6)/2.at n=3A071235
• Triangular numbers which are 8-almost primes.at n=26A076582
• a(n) = n! * Sum_{i+2j+3k=n} 1/(i!*(2j)!*(3k)!).at n=13A094717
• Hexagonal numbers whose number of divisors is also a hexagonal number.at n=12A116565
• Weight distribution of [73,37,13] binary quadratic-residue (or QR) code.at n=17A145982
• a(n) = sum of numbers from 1 to pi(n), where pi(n) = A007955(n).at n=26A184390
• Row sums of the triangle A045975.at n=26A204558
• Number of 2 X 2 matrices with all terms in {0,1,...,n} and even trace.at n=26A210378
• Triangular numbers divisible by the square of the sum of their digits.at n=14A243008
• a(n) = (n^2 + (n+1)^2)*(n^2 + (n+1)^2 + 2*n*(n+1)).at n=13A272850
• Triangle read by rows: T(n,m) is the number of pattern classes in the (n,m)-rectangular grid with 9 colors and n>=m, two patterns are in the same class if one of them can be obtained by a reflection or 180-degree rotation of the other.at n=22A286920
• Numbers that have exactly 8 representations as a k-gonal number, P(m,k) = m*((k-2)*m - (k-4))/2, k and m >= 3.at n=11A321158
• Number of inequivalent height 1 degree n polynomials with nonzero constant term.at n=12A323845
• Triangular numbers that are sum of squares of two distinct triangular numbers.at n=33A346386