Triangular array of Motzkin polynomial coefficients.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =3a(6) =1a(7) =6a(8) =2a(9) =1a(10) =10a(11) =10a(12) =1a(13) =15a(14) =30a(15) =5a(16) =1a(17) =21a(18) =70a(19) =35a(20) =1a(21) =28a(22) =140a(23) =140a(24) =14a(25) =1a(26) =36a(27) =252a(28) =420a(29) =126