cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A126064 Triangle read by rows, obtained by multiplying columns of triangle in A094587 by 1,2,4,8,16,... respectively.

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%I A126064 #20 Apr 04 2020 08:58:52
%S A126064 1,1,2,2,4,4,6,12,12,8,24,48,48,32,16,120,240,240,160,80,32,720,1440,
%T A126064 1440,960,480,192,64,5040,10080,10080,6720,3360,1344,448,128,40320,
%U A126064 80640,80640,53760,26880,10752,3584,1024,256,362880,725760,725760,483840,241920,96768,32256,9216,2304,512
%N A126064 Triangle read by rows, obtained by multiplying columns of triangle in A094587 by 1,2,4,8,16,... respectively.
%C A126064 Also obtained by multiplying the n-th rows of A094587 by the first (n+1) powers of 2: T(n,k) = A094587(n,k) * A059268(n,k), 0 <= k <= n. - _Reinhard Zumkeller_, Jul 05 2012
%H A126064 Reinhard Zumkeller, <a href="/A126064/b126064.txt">Rows n = 0..150 of triangle, flattened</a>
%H A126064 Peter Luschny, <a href="http://www.luschny.de/math/seq/variations.html">Variants of Variations</a>.
%e A126064 1
%e A126064 1, 2
%e A126064 2, 4, 4
%e A126064 6, 12, 12, 8
%e A126064 24, 48, 48, 32, 16
%e A126064 120, 240, 240, 160, 80, 32
%e A126064 720, 1440, 1440, 960, 480, 192, 64
%e A126064 5040, 10080, 10080, 6720, 3360, 1344, 448, 128
%p A126064 A126064 := proc(n,k) binomial(n,k)*(n-k)!*2^k ; end: for n from 0 to 13 do for k from 0 to n do printf("%d,",A126064(n,k)) ; od: od: # _R. J. Mathar_, Nov 02 2007
%t A126064 m = 9;
%t A126064 T = Transpose[2^Range[0, m] Table[n!/k!, {k, 0, m}, {n, 0, m}]];
%t A126064 Table[T[[n+1, k+1]], {n, 0, m}, {k, 0, n}] // Flatten (* _Jean-François Alcover_, Apr 04 2020 *)
%o A126064 (Haskell)
%o A126064 a126064 n k = a126064_tabl !! n !! k
%o A126064 a126064_row n = a126064_tabl !! n
%o A126064 a126064_tabl =  zipWith (zipWith (*)) a094587_tabl a059268_tabl
%o A126064 -- _Reinhard Zumkeller_, Jul 05 2012
%K A126064 nonn,tabl,easy
%O A126064 0,3
%A A126064 _N. J. A. Sloane_, Feb 28 2007
%E A126064 More terms from _R. J. Mathar_, Nov 02 2007