27408

Appears in sequences

• Number of ways to partition n elements into pie slices of different sizes of at least 2 allowing the pie to be turned over.at n=44A032230
• a(n) = digit reversal of A103741(n).at n=27A103763
• a(n) = digit reversal of A103764.at n=8A103837
• Numbers k such that lcm(1,2,3,...,k)/13 equals the denominator of the k-th harmonic number H(k).at n=34A112818
• Expansion of g.f.: (1 + x + x^2)/(1 - 2*x - 2*x^2).at n=10A121907
• Number of cycles in all cycle-up-down permutations of {1,2,...,n}. A permutation is said to be cycle-up-down if it is a product of up-down cycles. A cycle (b(1), b(2), ...) is said to be up-down if, when written with its smallest element in the first position, it satisfies b(1)<b(2)>b(3)<... .at n=7A186367
• T(n,k) = number of (n+1) X (k+1) 0..2 arrays with the number of clockwise edge increases in every 2 X 2 subblock unequal to the number of counterclockwise edge increases.at n=28A205823
• T(n,k) = number of (n+1) X (k+1) 0..2 arrays with the number of clockwise edge increases in every 2 X 2 subblock unequal to the number of counterclockwise edge increases.at n=35A205823
• Number of partitions p of n such that (number of numbers in p that have multiplicity 1) <= (number of numbers in p having multiplicity > 1).at n=42A330146
• a(n) is the determinant of the 2 X 2 matrix whose entries (when read by rows) are the n-th primes congruent to 1, 3, 5, 7 mod 8 respectively.at n=25A337145
• Expansion of (1+x) / (1-2*x-6*x^2).at n=8A384711