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A335688
Numerator of b(n), where b(1)=b(2)=1, and for n>2, b(n) = (1+b(n-2))/b(n-1).
2
1, 1, 2, 1, 3, 2, 6, 5, 126, 115, 297108, 1370225, 200590993732752, 531984953824739375, 27113273919595441588692453206842987776, 56653874513318656544104537473266204894369805859375
OFFSET
1,3
COMMENTS
With a tiny change in subscripts {b(n)} becomes the Lyness 5-cycle, a sequence of period 5, as illustrated in A076839.
EXAMPLE
1, 1, 2, 1, 3, 2/3, 6, 5/18, 126/5, 115/2268, 297108/575, 1370225/673840944, 200590993732752/787879375, ...
CROSSREFS
Sequence in context: A164768 A006208 A026805 * A206494 A022477 A238944
KEYWORD
nonn,frac
AUTHOR
N. J. A. Sloane, Jul 17 2020
STATUS
approved