35135945

Appears in sequences

• Expansion of (1+x)/cos(x).at n=13A009002
• Expansion of log(1 + tanh(x))/cos(x).at n=13A009391
• Expansion of e.g.f.: log(1+tanh(x))/cosh(x).at n=13A009392
• Expansion of e.g.f. x/cos(x) (odd powers only).at n=6A009843
• Expansion of e.g.f. x * (tan(x) + sec(x)).at n=12A065619
• Triangle, read by rows, equal to the matrix inverse of triangle A103327, where A103327(n,k) = binomial(2*n+1,2*k+1).at n=21A104033
• Expansion of e.g.f.: (1+x)*sech(x).at n=13A119882
• a(n) = Numerator((-1)^n*Euler(2*n)*(2*n+1)/(4^(2*n+1)-2^(2*n+1))), where Euler(n) = A122045(n).at n=6A160143
• Numerator of ez(n-1)*n!/(4^n-2^n) where ez(n) is the n-th coefficient of sec(t)+tan(t) for n>0, a(0) = 1.at n=13A193472
• Triangle of coefficients of the Pbar polynomials, read by rows.at n=21A245244
• Rectangular array read by ascending antidiagonals. Row n has the exponential generating function 1/M_{n}(z^n) where M_{n}(z) is the n-th Mittag-Leffler function, nonzero coefficients only, for n>=1.at n=34A274705
• 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=27A371687
• Triangle read by rows: T(n, k) = (2*n + 1)! * [y^(2*k)] [x^(2*n+1)] arctan(sec(x*y)*sinh(x)).at n=27A371688