354560

Appears in sequences

• Expansion of e.g.f. (1 + tan(x))/(1 - tan(x)).at n=8A000831
• E.g.f.: Sum_{n >= 0} a(n)*x^(2*n)/(2*n)! = sec(2*x).at n=4A002436
• Expansion of e.g.f. log(1 + tan(x)).at n=9A003707
• Triangle related to exp(x)*sec(2*x).at n=36A117436
• Exponential Riordan array [sec(2x), arctanh(tan(x))].at n=36A166317
• Exponential Riordan array [sech(2x), arctan(tanh(x))].at n=36A166318
• Sum of n and floor of each previous term divided by its distance from n.at n=25A180086
• The left-hand half-triangle of A185356 (or A202690).at n=43A202816
• The left-hand half-triangle of A185356 (or A202690).at n=44A202816
• Square array A(n,k), n>=0, k>=0, read by antidiagonals, where column k is the expansion of continued fraction 1/(1 - 2^k*x/(1 - 4^k*x/(1 - 6^k*x/(1 - 8^k*x/(1 - 10^k*x/(1 - ...)))))).at n=25A291260
• a(n) = 2^n*E2_{n}(1/2) with E2_{n} the polynomials defined in A326480.at n=8A326483
• Irregular triangle read by rows: coefficients of q-Eulerian polynomials of Type B.at n=23A333273
• Triangle read by rows: T(n, k) = (-1)^(n-k) * (2*n + 1)! * [y^(2*k)] [x^(2*n+1)] arctan(sec(x*y)*tanh(x)).at n=10A371687