Triangle arising in connection with deformations of type D Kleinian singularities.

Terms

a(0) =1a(1) =2a(2) =1a(3) =3a(4) =4a(5) =2a(6) =4a(7) =10a(8) =14a(9) =7a(10) =5a(11) =20a(12) =54a(13) =76a(14) =38a(15) =6a(16) =35a(17) =154a(18) =419a(19) =590a(20) =295a(21) =7a(22) =56a(23) =364a(24) =1616a(25) =4400a(26) =6196a(27) =3098a(28) =8a(29) =84