76627

Appears in sequences

• From area of cyclic polygon of 2n + 1 sides.at n=7A000531
• 11-gonal (or hendecagonal) pyramidal numbers: a(n) = n*(n+1)*(3*n-2)/2.at n=37A007586
• Strong pseudoprimes to base 7.at n=15A020233
• Strong pseudoprimes to base 26.at n=22A020252
• Strong pseudoprimes to base 49.at n=26A020275
• Strong pseudoprimes to base 63.at n=32A020289
• Triangle related to A001700 and A000302 (powers of 4).at n=37A046658
• Pseudoprimes to bases 3 and 7.at n=11A083735
• a(n) = (n/2)*binomial(n-1, floor((n-1)/2)) - 2^(n-2).at n=16A107373
• Let M(n) be the n X n matrix m(i,j)=min(i,j) for 1<=i,j<=n then a(n) is the trace of M(n)^(-8).at n=7A114360
• Infinite square array read by antidiagonals: a(q,n) is the coefficient of z^n in the series expansion of C(z)^q/(1-4z)^(3/2), where C(z) = (1-sqrt(1-4z))/(2z) is the Catalan function (q,n = 0,1,2,...).at n=43A143019
• Triangle of numbers of walks in the quarter-plane, of length 2n beginning and ending at the origin using steps {(1,1), (1,0), (-1,0), (-1,-1)} (Gessel steps) arranged according to the number of times the steps (1,1) and (-1,-1) occur.at n=43A157513
• a(n) = 2^(2*n - HammingWeight(n)) * [x^n] ((x-1)^(-1) + (1-x)^(-3/2)).at n=8A173384
• Riordan matrix (1/(1-4x),(1-sqrt(1-4x))/(2*sqrt(1-4x))).at n=37A188481
• Number of 7 X n binary arrays without the pattern 0 1 diagonally, vertically, antidiagonally or horizontally.at n=17A188558
• a(n) = (-1)^n*(A056040(n+1)*A152271(n)-2^n)/2.at n=16A194590
• Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..1 nX4 array.at n=4A220325
• T(n,k)=Equals two maps: number of nXk binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..1 nXk array.at n=32A220328
• Equals two maps: number of 5Xn binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and antidiagonal neighbors in a random 0..1 5Xn array.at n=3A220332
• Terms in A261524 that are not multiples of earlier terms.at n=13A261862