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Multiplication table of the square numbers read by antidiagonals.
4

%I #7 Apr 30 2014 01:27:39

%S 1,4,4,9,16,9,16,36,36,16,25,64,81,64,25,36,100,144,144,100,36,49,144,

%T 225,256,225,144,49,64,196,324,400,400,324,196,64,81,256,441,576,625,

%U 576,441,256,81,100,324,576,784,900,900,784,576,324,100,121,400,729

%N Multiplication table of the square numbers read by antidiagonals.

%C sum_{k=0..2n-2} (-1)^k*a(A000124(2n-2)+k-1) = n. See A003991. - _Charlie Marion_, Apr 22 2013

%F G.f.: [xy(1+x)(1+y)] / [(1-x)^3 * (1-y)^3 ]. - _Ralf Stephan_, Oct 27 2004

%e 1; 4,4; 9,16,9; 16,36,36,16; ...

%Y Cf. A003991, A098358, A098360, A098361.

%K nonn,tabl

%O 0,2

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