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A158440 Triangle T(n,k) read by rows: row n contains n times n+1 followed by n 1's.

%I A158440 #8 Jan 04 2019 18:55:19
%S A158440 2,1,3,3,1,1,4,4,4,1,1,1,5,5,5,5,1,1,1,1,6,6,6,6,6,1,1,1,1,1,7,7,7,7,
%T A158440 7,7,1,1,1,1,1,1,8,8,8,8,8,8,8,1,1,1,1,1,1,1,9,9,9,9,9,9,9,9,1,1,1,1,
%U A158440 1,1,1,1,10,10,10,10,10,10,10,10,10,1,1,1,1,1,1,1,1,1,11,11,11,11,11,11,11
%N A158440 Triangle T(n,k) read by rows: row n contains n times n+1 followed by n 1's.
%C A158440 These are essentially the unreduced numerators of the coefficients of P(2n-1,x) of A130679, with denominators represented by A122197.
%e A158440 The triangle has 2n columns in row n. It starts:
%e A158440   2, 1;
%e A158440   3, 3, 1, 1;
%e A158440   4, 4, 4, 1, 1, 1;
%e A158440   5, 5, 5, 5, 1, 1, 1, 1;
%t A158440 Flatten[Table[Join[PadRight[{},n,n+1],PadRight[{},n,1]],{n,12}]] (* _Harvey P. Dale_, Feb 18 2013 *)
%Y A158440 Cf. A003057.
%K A158440 nonn,easy,tabf
%O A158440 1,1
%A A158440 _Paul Curtz_, Mar 19 2009
%E A158440 Edited by _R. J. Mathar_, Apr 09 2009