39480

Appears in sequences

• Numbers that can be expressed as the difference of the squares of primes in exactly nine distinct ways.at n=4A092005
• Number of permutations of the multiset {1,1,2,2,...,n,n} with no two consecutive terms equal.at n=5A114938
• Amicable triples: numbers such that sigma(x) = sigma(y) = sigma(z) = x+y+z, x<y<z. We order these triples according to the common value of sigma. Sequence gives x numbers.at n=7A125490
• Coefficients of tribonacci numbers expansion : similar to the Fibonacci number expansion given in Steve Roman's Umbral Calculus.at n=41A137431
• Maximal length of rook tour on an n X n+4 board.at n=36A152135
• G.f. is the polynomial (1-x^3) * (1-x^6) * (1-x^9) * (1-x^12) * (1-x^15) * (1-x^18) * (1-x^21) / (1-x)^7.at n=16A162595
• Number of permutations of {1,...,n} avoiding adjacent step pattern up, down, down, down, down.at n=8A177524
• Number of right triangles on a (n+1)X7 grid.at n=23A189811
• Numbers with prime factorization pqrst^3.at n=28A189984
• Molecular topological index of the n-antiprism graph.at n=20A192791
• (Denominators of Cauchy numbers of the first kind c_{2n})/6.at n=22A222560
• (Denominators of Cauchy numbers of the second kind hat c_{2n})/6.at n=22A222561
• 4X4 square grid graph coloring a rectangular array: number of n X n 0..15 arrays where 0..15 label nodes of the square grid graph and every array movement to a horizontal or vertical neighbor moves along an edge of this graph.at n=2A223394
• 4X4 square grid graph coloring a rectangular array: number of nX3 0..15 arrays where 0..15 label nodes of the square grid graph and every array movement to a horizontal or vertical neighbor moves along an edge of this graph.at n=2A223397
• T(n,k)=4X4 square grid graph coloring a rectangular array: number of nXk 0..15 arrays where 0..15 label nodes of the square grid graph and every array movement to a horizontal or vertical neighbor moves along an edge of this graph.at n=12A223402
• Numbers n such that {largest m such that 1, 2, ..., m divide n} is different from {largest m such that m! divides n^2}.at n=23A232099
• Numbers that belong to at least one amicable tuple.at n=31A255215
• Number of (n+2)X(6+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the central row and column plus the two sums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally.at n=18A259004
• Expansion of Product_{k>=1} (1 + 5*x^k).at n=20A261569
• a(n) = n*(67*n - 89)/2.at n=35A263227