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%I #3 Aug 31 2015 02:53:23
%S 1,0,0,2,0,3,0,0,0,25,46,90,172,141,275,601,1102,2199,4150
%N Length of longest prefix of n-th row in A261712 coinciding with row n+1.
%C A261712(n+1,k) = A261712(n,k) for k = 1 .. a(n).
%o (Haskell)
%o a261727 n = a261727_list !! (n-1)
%o a261727_list = map (length . takeWhile (== 0)) $
%o zipWith (zipWith (-)) a261712_tabf $ tail a261712_tabf
%Y Cf. A261712, A261646, A261416.
%K nonn,more
%O 1,4
%A _Reinhard Zumkeller_, Aug 31 2015