Number of ascents in all peakless Motzkin paths of length n+3.

Terms

a(0) =1a(1) =3a(2) =7a(3) =18a(4) =46a(5) =116a(6) =294a(7) =746a(8) =1894a(9) =4816a(10) =12262a(11) =31258a(12) =79777a(13) =203833a(14) =521337a(15) =1334690a(16) =3420039a(17) =8770891a(18) =22510949a(19) =57817420a(20) =148599626a(21) =382165858a(22) =983430962a(23) =2532082308a(24) =6522876601a(25) =16811813391a(26) =43350264107a(27) =111830286218