Triangle read by rows: number of meanders filling out an n X k grid, unreduced for symmetry.

Terms

a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =0a(6) =0a(7) =1a(8) =2a(9) =11a(10) =0a(11) =1a(12) =2a(13) =42a(14) =320a(15) =0a(16) =1a(17) =6a(18) =199a(19) =3278a(20) =71648a(21) =0a(22) =1a(23) =10a(24) =858a(25) =29904a(26) =1369736a(27) =55717584a(28) =0a(29) =1