A012995 - OEIS

%I #5 Sep 30 2025 20:34:17

%S 1,4,72,3510,315000,45898650,9783981900,2881566037350,

%T 1118460016674000,553787154746075250,340453667922140272500,

%U 254502044013845436558750,227301229608843762807435000

%N sec(arctan(x)+arcsin(x))=1+4/2!*x^2+72/4!*x^4+3510/6!*x^6+315000/8!*x^8...

%K nonn

%O 0,2

%A _Patrick Demichel_