-1673
domain: Z
Appears in sequences
- Coefficients of modular function G_4(tau).at n=18A005762
- New tetradiagonal form matrix as triangular sequence from solution of : X(n,m)=Steinbach(n,m)^(-1).tri-Antidiagonal_1(n,n).at n=71A124020
- 2+4*2^n-3^n.at n=7A135913
- Expansion of x^5/((1-x)*(1+x-x^5)).at n=55A174532
- 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=58A219120
- Alternating sum of 10-gonal (or decagonal) pyramidal numbers.at n=13A269441
- a(n) = 2^(2n+1)*cos(nA), where A is the angle opposite side BC in a triangle ABC having sidelengths |BC|=2, |CA| = 3, |AB| = 4; ABC is the smallest integer-sided scalene triangle.at n=5A375880