28592

Appears in sequences

• Number of 4 X n nonnegative integer matrices with all column sums 3, up to row and column permutation.at n=7A058409
• Number of returns to the x-axis in all hill-free Schroeder paths of length 2n+4. A Schroeder path of length 2n is a lattice path from (0,0) to (2n,0) consisting of U=(1,1), D=(1,-1) and H=(2,0) steps and never going below the x-axis. A hill is a peak at height 1.at n=6A114693
• Numbers k such that k and k + 1 are both of the form p*q^4 where p and q are distinct primes.at n=7A215197
• Numbers k such that both k and k+1 are not exponentially squarefree numbers.at n=21A342188
• Number of edges formed in a square by straight line segments when connecting the n+1 points along each edge that divide it into n equal parts to the n+1 points on the edge on the opposite side of the square.at n=9A355840
• Numbers k such that k and k+1 both have the same number of squarefree divisors and powerful divisors.at n=11A360904