Moments of generalized Motzkin paths.

Terms

a(0) =1a(1) =0a(2) =4a(3) =4a(4) =16a(5) =24a(6) =71a(7) =128a(8) =328a(9) =650a(10) =1552a(11) =3232a(12) =7437a(13) =15904a(14) =35884a(15) =77840a(16) =173792a(17) =379896a(18) =843411a(19) =1851264a(20) =4097552a(21) =9014038a(22) =19918944a(23) =43871360a(24) =96860441a(25) =213472064a(26) =471086932a(27) =1038595100a(28) =2291372912a(29) =5052682904