-661

Appears in sequences

• Triangle T, read by rows, where all columns of T are different and yet all columns of the matrix square T^2 (A118407) are equal; also equals the matrix inverse of triangle A118400.at n=131A118404
• Primes or negative values of primes of the form 8*n^2 - 298*n + 2113 for n >= 0.at n=19A217439
• Primes or negative values of primes of the form 8*n^2 - 326*n + 2659 for n >= 0.at n=20A217440
• a(n) = 6*n^3 - 263*n^2 + 3469*n - 12841.at n=20A218457
• Alternating sum of heptagonal pyramidal numbers.at n=11A269428
• First differences of number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 201", based on the 5-celled von Neumann neighborhood.at n=17A270723
• G.f. A(x,y) satisfies: A(x,y) = x * (1 + y*A(x,y)*A'(x,y)) / (1 + A(x,y)*A'(x,y)), where A'(x,y) = d/dx A(x,y).at n=11A301930
• G.f. Sum_{n=-oo..+oo} (x^n - x)^(n+1).at n=57A378582