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A294688
Palindromes in Narayana's cows sequence (A000930).
1
1, 2, 3, 4, 6, 9, 88, 595
OFFSET
1,2
COMMENTS
595 is probably the last term.
MAPLE
a := proc(n) if n < 4 then n else
simplify(hypergeom([-n/3, (1-n)/3, (-1-n)/3], [-n/2, (-1-n)/2], -27/4));
convert(%, base, 10); ListTools:-Reverse(%);
if %% = % then add(%[k]*10^(k-1), k=1..nops(%)) else NULL fi fi end:
seq(a(n), n=1..200); # Peter Luschny, Nov 07 2017
CROSSREFS
KEYWORD
nonn,base,more,hard
AUTHOR
Chai Wah Wu, Nov 06 2017
STATUS
approved