Triangle T(n,d) read by rows: Number of ascent sequences of length n with d zeros.

Terms

a(0) =1a(1) =1a(2) =1a(3) =2a(4) =2a(5) =1a(6) =5a(7) =6a(8) =3a(9) =1a(10) =15a(11) =21a(12) =12a(13) =4a(14) =1a(15) =53a(16) =84a(17) =54a(18) =20a(19) =5a(20) =1a(21) =217a(22) =380a(23) =270a(24) =110a(25) =30a(26) =6a(27) =1a(28) =1014a(29) =1926