61380

Appears in sequences

• a(n) = floor(n*(n-1)*(n-2)*(n-3)/16).at n=33A011926
• Triangle of nonzero coefficients of the Airy zeta functions expressed as polynomials of X = 3^(5/6)Gamma(2/3)^2/(2Pi).at n=30A096631
• Triangle T, read by rows, such that the matrix inverse satisfies: [T^-1](n,k) = -(k+1)*T(n-1,0) for n>k>=0, with T(n,n)=1 for n>=0.at n=38A112911
• Column 2 of triangle A112911.at n=6A112913
• Averages of twin prime pairs of A074378.at n=17A154563
• Number of n X 4 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 0 1 vertically.at n=17A207449
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 873", based on the 5-celled von Neumann neighborhood.at n=36A273709
• Let p = n-th prime == 7 mod 8; a(n) = sum of quadratic residues mod p that are < p/2.at n=42A282039
• Numbers k with record value of the least strong pseudoprime to base k (A298756).at n=8A298757
• Numbers k satisfying gcd(k^2, sigma(k^2)) > sigma(k), where sigma is the sum-of-divisors function.at n=28A322154
• a(n) is the number in the first column of the Trithoff (tribonacci) array that starts off the row containing the tail of n times the tribonacci sequence.at n=35A351689