Duplicate of A077042 with alternating up/down antidiagonals.

Terms

a(0) =1a(1) =2a(2) =1a(3) =1a(4) =3a(5) =3a(6) =6a(7) =7a(8) =4a(9) =1a(10) =1a(11) =5a(12) =12a(13) =19a(14) =10a(15) =20a(16) =51a(17) =44a(18) =19a(19) =6a(20) =1a(21) =1a(22) =7a(23) =27a(24) =85a(25) =155a(26) =141a(27) =35a(28) =70a(29) =393