A boustrophedon triangle.

Terms

a(0) =1a(1) =1a(2) =2a(3) =4a(4) =3a(5) =1a(6) =1a(7) =5a(8) =8a(9) =9a(10) =24a(11) =23a(12) =18a(13) =10a(14) =1a(15) =1a(16) =25a(17) =48a(18) =66a(19) =76a(20) =77a(21) =294a(22) =293a(23) =268a(24) =220a(25) =154a(26) =78a(27) =1a(28) =1a(29) =295