Triangle T(n,k) = A136451(n,k), except T(0,0)=2.

Terms

a(0) =2a(1) =2a(2) =-1a(3) =-3a(4) =2a(5) =1a(6) =-4a(7) =6a(8) =2a(9) =-1a(10) =5a(11) =-10a(12) =-9a(13) =2a(14) =1a(15) =6a(16) =-19a(17) =-16a(18) =12a(19) =2a(20) =-1a(21) =-7a(22) =28a(23) =42a(24) =-22a(25) =-15a(26) =2a(27) =1a(28) =-8a(29) =44