%I A059446
%S A059446 1,1,1,2,3,2,6,10,10,6,24,42,52,42,24,120,216,300,300,216,120,720,
%T A059446 1320,1968,2268,1968,1320,720,5040,9360,14640,18576,18576,14640,
%U A059446 9360,5040,40320,75600,122400,166320,184896,166320,122400,75600
%N A059446 Triangle T(n,k) = coefficient of x^n*y^k/(n!*k!) in 1/(1-x-y-x*y), read 
               by rows in order 00, 10, 01, 20, 11, 02, ...
%F A059446 E.g.f.: 1/(1-x-y-x*y).
%e A059446 1; 1,1; 2,3,2; 6,10,10,6; ...
%p A059446 read transforms; SERIES2(1/(1-x-y-x*y),x,y,12): SERIES2TOLISTMULT(%,x,
               y,12);
%Y A059446 Cf. A008288.
%Y A059446 Sequence in context: A025502 A110777 A087454 this_sequence A143806 A109878 
               A104565
%Y A059446 Adjacent sequences: A059443 A059444 A059445 this_sequence A059447 A059448 
               A059449
%K A059446 nonn,tabl,easy
%O A059446 0,4
%A A059446 N. J. A. Sloane (njas(AT)research.att.com), Feb 02 2001