26069

Appears in sequences

• a(n) = n^3 - n^2 - n - 1.at n=30A083074
• Starting positions of strings of three 9's in the decimal expansion of Pi.at n=30A083642
• Number of free hexagonal polygons of symmetry class C_(2v) and area n.at n=15A120991
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, -1, 1), (-1, 1, -1), (1, 0, -1), (1, 0, 1)}.at n=10A148547
• Lucas pseudoprimes.at n=24A217120
• Number of self-inverse permutations in S_n with longest increasing subsequence of length 6.at n=6A217326
• Not appropriate for the OEIS.at n=13A248690
• Squarefree semiprimes of the form (2*p - 3) * (3*p - 2), p prime.at n=9A259758
• Semiprimes whose prime factors are of equal binary length and which differ from each other in exactly two bit positions.at n=52A261074
• Number of self-inverse permutations of [2n] with longest increasing subsequence of length n.at n=6A267436
• Solution (a(n)) of the complementary equation a(n) = 2*a(n-1) - a(n-2) + b(n-1) + b(n); see Comments.at n=39A305330