Number of integer compositions of n that match the dashed pattern 3-12.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =4a(8) =14a(9) =41a(10) =110a(11) =278a(12) =673a(13) =1576a(14) =3599a(15) =8055a(16) =17732a(17) =38509a(18) =82683a(19) =175830a(20) =370856a(21) =776723a(22) =1616945a(23) =3348500a(24) =6902905a(25) =14174198a(26) =29004911a(27) =59175625a(28) =120414435a(29) =244468774