18603

Appears in sequences

• Orders of non-cyclic simple groups (divided by 4).at n=28A008976
• Numbers k that divide s(k), where s(1)=1, s(j)=13*s(j-1)+j.at n=29A014861
• a(n) is both the sum of n+1 consecutive integers and the sum of the n immediately higher consecutive integers.at n=26A059270
• Number of 2 X 2 nonsingular 0..n matrices with rows in increasing order.at n=12A183761
• 13 times hexagonal numbers: a(n) = 13*n*(2*n-1).at n=27A194713
• Number of n X 2 arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 n X 2 array.at n=26A219680
• Number of nX4 0..1 arrays with every element unequal to 0, 1, 3 or 4 king-move adjacent elements, with upper left element zero.at n=12A303804
• a(n) = n*(2*n + 1)*(4*n + 1).at n=13A316224
• (1/4) * number of ways to select 3 distinct points forming a triangle of unsigned area = n/2 from a square of grid points with side length n.at n=18A320310