17975

Appears in sequences

• Expansion of 1/((1-x)*(1-x-2*x^3)).at n=18A003479
• Left diagonal of partition triangle A047812.at n=34A007042
• Centered 19-gonal numbers.at n=43A069132
• Expansion of x*(-1+2*x-x^2+7*x^3+8*x^4-7*x^5+8*x^6) / ((4*x^3-x^2+3*x-1)*(2*x^4-2*x^3+3*x^2+1)*(x-1)^2).at n=11A109249
• Positions of harmonic numbers in the EKG sequence.at n=13A140804
• Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0), ending on the vertical axis and consisting of n steps taken from {(-1, -1), (-1, 0), (0, -1), (0, 1), (1, -1), (1, 1)}.at n=8A151473
• Numbers m having the same sum of divisors as m+20 has.at n=30A181647
• Number of nXnXn 0..6 triangular arrays with each element x equal to the number its neighbors equal to 3,1,1,1,0,0,0 for x=0,1,2,3,4,5,6.at n=4A203209
• Number of 2 X n arrays of the minimum value of corresponding elements and their horizontal, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..3 2 X n array.at n=18A220045
• Number of FF-equivalence classes of Łukasiewicz paths. Łukasiewicz paths are P-equivalent iff the positions of pattern P are identical in these paths.at n=18A302483
• Number of integer partitions of n with 2 distinct parts or at least 3 parts.at n=36A325269
• a(n)/144 is the maximum squared volume of a tetrahedron with the sum of its integer edge lengths equal to n.at n=19A371073