OFFSET
0,4
LINKS
Robert Israel, Table of n, a(n) for n = 0..368
MAPLE
S:= series((1 + sqrt(1-2*sin(2*x)))/(2*cos(x)), x, 51):
seq(coeff(S, x, j)*j!, j=0..50);
MATHEMATICA
m = 20; A[x_] = (1 + Sqrt[1 - 2 Sin[2x]] )/(2 Cos[x]); Range[0, m-1]! * CoefficientList[A[x] + O[x]^m, x] (* Jean-François Alcover, Apr 29 2019 *)
CROSSREFS
KEYWORD
sign
AUTHOR
Robert Israel, Aug 29 2018
STATUS
approved