1355520

Appears in sequences

• sec(sinh(x)*arcsin(x))=1+12/4!*x^4+240/6!*x^6+15120/8!*x^8...at n=5A012543
• Triangle read by rows: T(n,k) = number of vertex labeled connected Goldstone diagrams with n interactions and k external potentials.at n=16A328921