Pascal-(1,2,1) array read by antidiagonals.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =1a(6) =1a(7) =7a(8) =7a(9) =1a(10) =1a(11) =10a(12) =22a(13) =10a(14) =1a(15) =1a(16) =13a(17) =46a(18) =46a(19) =13a(20) =1a(21) =1a(22) =16a(23) =79a(24) =136a(25) =79a(26) =16a(27) =1a(28) =1a(29) =19