Same rule as Aitken triangle (A011971) except a(0,0)=1, a(1,0)=0.

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =1a(5) =2a(6) =2a(7) =3a(8) =4a(9) =6a(10) =6a(11) =8a(12) =11a(13) =15a(14) =21a(15) =21a(16) =27a(17) =35a(18) =46a(19) =61a(20) =82a(21) =82a(22) =103a(23) =130a(24) =165a(25) =211a(26) =272a(27) =354a(28) =354a(29) =436