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Multiplication table of the powers of 2 read by antidiagonals.
3

%I #7 Nov 21 2021 16:49:19

%S 4,8,8,16,16,16,32,32,32,32,64,64,64,64,64,128,128,128,128,128,128,

%T 256,256,256,256,256,256,256,512,512,512,512,512,512,512,512,1024,

%U 1024,1024,1024,1024,1024,1024,1024,1024,2048,2048,2048,2048,2048,2048,2048,2048

%N Multiplication table of the powers of 2 read by antidiagonals.

%H Harvey P. Dale, <a href="/A098354/b098354.txt">Table of n, a(n) for n = 1..1000</a>

%H <a href="/index/Di#divseq">Index to divisibility sequences</a>

%e 4; 8,8; 16,16,16; 32,32,32,32; ...

%t Table[PadRight[{},n-1,2^n],{n,2,12}]//Flatten (* _Harvey P. Dale_, Nov 21 2021 *)

%o (PARI) for(n=2,9,for(i=1,n-1,print1(2^n", "))) \\ _Charles R Greathouse IV_, Apr 09 2012

%Y Cf. A003991, A098355.

%K nonn,tabl,easy

%O 1,1

%A Douglas Stones (dssto1(AT)student.monash.edu.au), Sep 04 2004