426240

Appears in sequences

• sec(tanh(x)+tan(x))=1+4/2!*x^2+80/4!*x^4+4288/6!*x^6+426240/8!*x^8...at n=4A013139
• Theta series of lattice Kappa_8.at n=37A015235
• Given a row of n payphones (or phone booths), all initially unused, sequence gives number of ways for n people to choose the payphones assuming each always chooses one of the most distant payphones from those in use already.at n=13A095236
• Number of odd fixed diagonal Latin squares.at n=5A114632
• Terms satisfy: a(2*n) = a(n)*b(n) and a(2*n+1) = a(n+1)*b(n) for n>=0 with a(0)=1, where A(x)^2 = Sum_{n>=0} b(n)*x^n and g.f. A(x) = Sum_{n>=0} a(n)*x^n.at n=16A265264
• Triangle read by rows: T(n, k) = n! * 3^k * hypergeom([-k], [-n], 2/3).at n=38A375600