A249307 - OEIS

%I #7 Aug 01 2019 10:42:56

%S 1,1,2,4,1,2,8,8,16,1,2,12,16,48,32,64,1,2,16,24,96,96,256,128,256,1,

%T 2,20,32,160,192,640,512,1280,512,1024,1,2,24,40,240,320,1280,1280,

%U 3840,2560,6144,2048,4096,1,2,28,48,336,480,2240,2560,8960,7680

%N Triangle read by rows: A249095(n,k) * 2^k, k = 0 .. 2*n+1.

%C Length of row n = 2*n+1;

%C T(n,2*n+1) = 4^n = A000302(n);

%C for n > 0: sum of row n = 7*5^(n-1), cf. A005055.

%H Reinhard Zumkeller, <a href="/A249307/b249307.txt">Rows n = 0..125 of triangle, flattened</a>

%o (Haskell)

%o a249307 n k = a249307_tabf !! n !! k

%o a249307_row n = a249307_tabf !! n

%o a249307_tabf = map (zipWith (*) a000079_list) a249095_tabf

%Y Cf. A249095, A000079, A005408 (row lengths), A249308 (central terms), A000302 (right edge), A005055 (row sums, except for initial 1), A013609.

%Y Cf. A013609.

%K nonn,tabf

%O 0,3

%A _Reinhard Zumkeller_, Nov 14 2014