27550

Appears in sequences

• Coordination sequence for 4-dimensional I-centered cubic orthogonal lattice.at n=19A008532
• Conjectured number of irreducible multiple zeta values of depth 7 and weight 2n+19.at n=23A022495
• Numerators of continued fraction convergents to sqrt(108).at n=8A041194
• Number of primitive (aperiodic) step shifted (decimated) sequence structures using a maximum of six different symbols.at n=9A056405
• a(n) = A063997(n)/4.at n=34A088406
• a(n) = prime(n)_prime(n).at n=37A122622
• a(n) = Sum_{i=n..n+3} Sum_{j=i+1..n+4} prime(i)*prime(j).at n=13A127350
• Numbers k such that k and k^2 use only the digits 0, 2, 5, 7 and 9.at n=33A136917
• G.f.: A(x,y) = Sum_{n>=0,m>=0} (2^m-1)^n*x^n * log(1+y)^m/m!.at n=40A163353
• Easter occurrences on March 22, March 23, ..., April 25 during a 5,700,000-year Gregorian Easter cycle.at n=0A224110
• Number of (n+2)X(1+2) 0..4 arrays with every row, column, diagonal or antidiagonal in each 3X3 subblock summing to a prime.at n=2A251956
• Number of (n+2)X(3+2) 0..4 arrays with every row, column, diagonal or antidiagonal in each 3X3 subblock summing to a prime.at n=0A251958
• T(n,k)=Number of (n+2)X(k+2) 0..4 arrays with every row, column, diagonal or antidiagonal in each 3X3 subblock summing to a prime.at n=3A251962
• T(n,k)=Number of (n+2)X(k+2) 0..4 arrays with every row, column, diagonal or antidiagonal in each 3X3 subblock summing to a prime.at n=5A251962
• 26-gonal pyramidal numbers: a(n) = n*(n+1)*(8*n-7)/2.at n=19A256646
• Expansion of Product_{k>=1} 1/((1 - x^k)*(1 - x^(5*k))).at n=35A318028
• a(n) = ((1 - sqrt(3))^n + (1 + sqrt(3))^n)/2^floor((n - 1)/2); n-th row common denominator of A321118.at n=15A321119
• Total number of nodes in all self-avoiding planar walks starting at (0,0), ending at (n,0), not extending above the line (x,2x) or below the line (x,-2x), and using steps (0,1), (-1,1), and (1,-1) with the restriction that (-1,1) and (1,-1) are always immediately followed by (0,1).at n=9A328140
• a(n) is the number of perfect matchings of an edge-labeled 2 X n Klein bottle grid graph, or equivalently the number of domino tilings of a 2 X n Klein bottle grid. (The twist is on the length-n side.)at n=14A351635
• Number of compositions (ordered partitions) of n into Jacobsthal numbers 1,3,5,11,21,43, ... (A001045).at n=24A357519