%I #7 Aug 31 2015 21:37:32
%S 1,1,1,3,5,7,15,27,49,90,171,326,613,1174,2255,4333,8386,16213,31457,
%T 61097,118577,230322,447767,870570,1693887,3297343,6423347,12523562,
%U 24435171,47707012,93215393,182260604,356622869,698284551,1368195878,2682527954,5262729874,10330704931
%N Row lengths in A261644.
%C First differences of A261396;
%C also row lengths in A261712.
%F a(n) = A261396(n) - A261396(n-1).
%o (Haskell)
%o a261646 = length . a261644_row
%Y Cf. A261644, A261712, A261396.
%K nonn
%O 1,4
%A _Reinhard Zumkeller_, Aug 31 2015
%E a(21)-a(38) from _Chai Wah Wu_, Aug 31 2015
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