Third row of Pascal-(1,3,1) array A081578.

Terms

a(0) =1a(1) =9a(2) =33a(3) =73a(4) =129a(5) =201a(6) =289a(7) =393a(8) =513a(9) =649a(10) =801a(11) =969a(12) =1153a(13) =1353a(14) =1569a(15) =1801a(16) =2049a(17) =2313a(18) =2593a(19) =2889a(20) =3201a(21) =3529a(22) =3873a(23) =4233a(24) =4609a(25) =5001a(26) =5409a(27) =5833a(28) =6273a(29) =6729