-229

Appears in sequences

• a(n) = floor(Sum_{k=0..n} tan(k)).at n=15A051508
• a(n) = floor(Sum_{k=0..n} tan(k)).at n=16A051508
• a(n) = floor(Sum_{k=0..n} tan(k)).at n=28A051508
• a(n) = round(Sum_{k=0..n} tan(k)).at n=15A051509
• Expansion of (1-x-x^N)/((1-x)(1-x^2)(1-x^3)...(1-x^N)) for N = 6.at n=27A060025
• Expansion of (1-x) / (1+x^2+2*x^3).at n=17A078033
• A nonsense sequence.at n=20A089075
• Triangular matrix, read by rows, where T(n,k) = T(n-1,k) - [T^-1](n-1,k-1); also equals the matrix inverse of A060083 (Euler polynomials).at n=23A102054
• Column 2 of A102054, the matrix inverse of A060083 (Euler polynomials).at n=4A102056
• Coefficients of numerator polynomials of g.f.s for a certain necklace problem involving prime numbers.at n=22A103728
• Central numbers in triangle A103728.at n=3A103920
• G.f. A(x) satisfies: A(x)^3 equals the g.f. of A110640, which consists entirely of numbers 1 through 9.at n=14A112573
• Expansion of (1+x)^2/(1-2x^2+x^3).at n=17A113312
• a(n) = -n^2 + 9*n + 23.at n=21A126719
• Expansion of -(3+9*x+2*x^2)/((x+1)*(x^2+3*x+1)).at n=7A131589
• Triangle read by rows: coefficients of polynomials arising from the recurrence A[n](x) = A[n-1]'(x)/(1-x) with A[0] = exp(x).at n=14A144505
• Triangle t(n, k) = k*n*(prime(n+2) - 2*prime(n+1) + prime(n)) + prime(n), 0 <= k <= n = 1, 2, 3, ...at n=51A147815
• Riordan's general Eulerian recursion: T(n, k) = (k+2)*T(n-1, k) + (n-k-1) * T(n-1, k-1) with T(n,1) = 1, T(n,n) = (-1)^(n-1).at n=16A157013
• A (1, 2) Somos-4 sequence associated to the elliptic curve E: y^2 + x*y - y = x^3 - x.at n=6A178621
• n*a(n) provides the Moebius transform of signed central binomial coefficients.at n=14A178749