-545

Appears in sequences

• Expansion of 1/(1 + 2*x - x^2 + x^3).at n=7A077986
• Inverse image of primes 2,3,5,7,... under the map Q defined in A095172.at n=63A095174
• Triangular matrix T, read by rows, that satisfies: [T^-k](n,k) = -T(n,k-1) for n >= k > 0, or, equivalently, (column k of T^-k) = -SHIFT_LEFT(column k-1 of T) when zeros above the diagonal are ignored. Also, matrix inverse of triangle A107876.at n=50A107889
• Row sums of a characteristic triangle for the Fibonacci numbers.at n=8A110034
• a(0) = 121; for n>0, a(n) = a(n-1) - n + 1.at n=37A137517
• Triangle T(n,k) = (-1)^k * A119258(n,k) read by rows, 0 <= k <= n.at n=48A145661
• Numerator of Bernoulli(n, 3/8).at n=5A158697
• Triangle, read by rows, where T(n,k) is defined for n>=1, k=1..2*n-1, by a formula analogous to the second-order Eulerian triangle A008517.at n=44A219120
• Sum{gcd(k^2 + t^2, n) * cos(2*Pi*(k^2 + t^2)/n): 0<k,t<=n}.at n=50A239444
• G.f.: x^((k^2+k)/2)/(mul(1-x^i,i=1..k)*mul(1+x^r,r=1..oo)) with k = 4.at n=59A246583
• G.f.: 1/(1 - x/(1+2*x - x^3/(1+2*x^2 - x^5/(1+2*x^3 - x^7/(1+2*x^4 - x^9/(1 - ...)))))), a continued fraction.at n=48A275761
• a(n) is the minimal determinant of an n X n symmetric Toeplitz matrix having 1 on the main diagonal and all the integers 1, 2, ..., n-1 off-diagonal.at n=5A374239