%I A104443
%S A104443 1,1,1,1,3,1,1,2,15,1,1,2,5,105,1,1,2,4,15,945,1,1,2,4,11,55,10395,1,1,
%T A104443 2,4,10,23,232,135135,1,1,2,4,10,21,68,1161,2027025,1
%N A104443 Square of P(n,t) read by antidiagonals. P(n,t)=ways to split 1, 2, 3, 
               ..., tn into n arithmetical progressions each with t terms.
%Y A104443 Cf. A104429-A104442. P(1, _)=A000012, P(_, 1)=A000012, P(_, 2)=A001147.
%Y A104443 Sequence in context: A143934 A086639 A016564 this_sequence A103496 A124921 
               A076498
%Y A104443 Adjacent sequences: A104440 A104441 A104442 this_sequence A104444 A104445 
               A104446
%K A104443 nonn
%O A104443 1,5
%A A104443 Jonas Wallgren (jonwa(AT)ida.liu.se), Mar 17 2005