Moments of generalized Motzkin paths.

Terms

a(0) =1a(1) =0a(2) =2a(3) =1a(4) =6a(5) =6a(6) =21a(7) =30a(8) =82a(9) =141a(10) =342a(11) =650a(12) =1485a(13) =2982a(14) =6612a(15) =13693a(16) =29922a(17) =63072a(18) =136905a(19) =291618a(20) =631302a(21) =1353441a(22) =2928054a(23) =6303798a(24) =13642117a(25) =29454702a(26) =63791456a(27) =138020533a(28) =299191968a(29) =648376932