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 A071021 Square array T(i,j) = Bernoulli(2i)*Bernoulli(2j) read by antidiagonals: denominators. 1

%I

%S 1,6,6,30,36,30,42,180,180,42,30,252,900,252,30,66,180,1260,1260,180,

%T 66,2730,396,900,1764,900,396,2730,6,16380,396,1260,1260,396,16380,6,

%U 510,36,81900,2772,900,2772,81900,36,510,798,3060,180,114660,396,396,114660

%N Square array T(i,j) = Bernoulli(2i)*Bernoulli(2j) read by antidiagonals: denominators.

%p f:=(i,j)->denom(bernoulli(2*i)*bernoulli(2*j)):lon:=5:i:=[seq(op([seq(k,k=0..2*s-1),seq(2*s-2-k,k=0..2*s-2)]),s=1..lon)]:j:=[0,seq(op([seq(k,k=0..2*s),seq(2*s-1-k,k=0..2*s-1)]),s=1..lon)]:seq(f(i[n],j[n]),n=1..min(nops(i),nops(j))); (C. Ronaldo)

%Y Cf. A071020.

%K nonn,tabl,frac

%O 0,2

%A _N. J. A. Sloane_, May 24 2002

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Last modified March 20 09:03 EDT 2023. Contains 361365 sequences. (Running on oeis4.)