OFFSET
1,2
LINKS
Ed Pegg, Jr., Math. Puzzles
FORMULA
a(n) = (q!^2-1)/p where q=(p-1)/2 and p = A002145(n). - Sean A. Irvine, Oct 02 2023
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Dec 13 2001
EXTENSIONS
Missing a(1)=0 inserted by Sean A. Irvine, Oct 02 2023
STATUS
approved