151981

Appears in sequences

• a(n) = AlexanderPolynomial[n] defined as Det[Transpose[S]-n S] where S is Kronecker Product of two 2 X 2 Seifert matrices {{-1, 1}, {0, -1}} [X] {{-1, 1}, {0, -1}} = {{1, -1, -1, 1}, {0, 1, 0, -1}, {0, 0, 1, -1}, {0, 0, 0, 1}}.at n=20A138849
• Number of n X 3 0..1 arrays avoiding 0 0 0 horizontally and 0 1 0 vertically.at n=6A207177
• T(n,k)=Number of nXk 0..1 arrays avoiding 0 0 0 horizontally and 0 1 0 vertically.at n=42A207182
• Number of 7Xn 0..1 arrays avoiding 0 0 0 horizontally and 0 1 0 vertically.at n=2A207186
• Vertical moments of inertia of a unit lozenge tiling of the hexagon with side lengths n (see references for exact configuration).at n=18A374083