Triangle associated with the set S of squares {0,1,4,9,16,...}.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =12a(5) =1a(6) =1a(7) =30a(8) =30a(9) =1a(10) =1a(11) =56a(12) =140a(13) =56a(14) =1a(15) =1a(16) =90a(17) =420a(18) =420a(19) =90a(20) =1a(21) =1a(22) =132a(23) =990a(24) =1848a(25) =990a(26) =132a(27) =1a(28) =1a(29) =182