Number of integer compositions of n that are weakly alternating and have at least two adjacent equal parts.

A349800

Number of integer compositions of n that are weakly alternating and have at least two adjacent equal parts.

Terms

    a(0) =0a(1) =0a(2) =1a(3) =1a(4) =4a(5) =9a(6) =16a(7) =33a(8) =62a(9) =113a(10) =205a(11) =373a(12) =664a(13) =1190a(14) =2113a(15) =3744a(16) =6618a(17) =11683a(18) =20564a(19) =36164a(20) =63489a(21) =111343a(22) =195042a(23) =341357a(24) =596892a(25) =1042976a(26) =1821179a(27) =3178145a(28) =5543173a(29) =9663545

External references