Convolution triangle by rows, row sums = the Robbins sequence, A005130 starting with offset 1.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =1a(5) =3a(6) =18a(7) =3a(8) =3a(9) =18a(10) =192a(11) =18a(12) =9a(13) =18a(14) =192a(15) =3472a(16) =192a(17) =54a(18) =54a(19) =192a(20) =3472a(21) =104964a(22) =3472a(23) =576a(24) =324a(25) =576a(26) =3472a(27) =104964a(28) =5606272a(29) =104964