OFFSET
1,2
LINKS
Alois P. Heinz, Table of n, a(n) for n = 1..14335
Vladimir Reshetnikov, 2-3 sequence puzzle, SeqFan list, Mar 18 2015
FORMULA
a(2*n-1) = A081241(2*A081241(a(n-1))+1) and a(2*n) = A081241(A081241(a(2*n-1))+1) for n >= 7. - Pontus von Brömssen, Aug 10 2024
EXAMPLE
a(6) = 7; tower(7) = 2^2^2 = 2^4 = 16.
a(7) = 6; tower(6) = 3^3 = 27.
a(8) = 11; tower(11) = 3^2^2 = 3^4 = 81.
a(9) = 8; tower(8) = 2^2^3 = 2^8 = 256.
CROSSREFS
KEYWORD
nonn,look
AUTHOR
Vladimir Reshetnikov, Feb 07 2011
EXTENSIONS
More terms from Alois P. Heinz, Apr 05 2011
STATUS
approved