OFFSET
1,1
LINKS
Clark Kimberling, Table of n, a(n) for n = 1..1000
FORMULA
r = sum{(n!^4)*p(4,n)/(4*n + 3)!, n >= 0}, where p(k,n) is defined at A248664.
EXAMPLE
r = 2.718702641910851497086752200287756621...
MATHEMATICA
RealDigits[Sum[(Floor[n/4])!^4/n!, {n, 0, 400}], 10, 111][[1]]
PROG
(PARI) suminf(n=0, ((n\4)!)^4/n!) \\ Michel Marcus, Feb 23 2016
CROSSREFS
KEYWORD
AUTHOR
Clark Kimberling, Oct 11 2014
STATUS
approved