Number of compositions of n with no adjacent triples (..., x, y, z, ...) where x < y < z or x > y > z.

A344614

Number of compositions of n with no adjacent triples (..., x, y, z, ...) where x < y < z or x > y > z.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =4a(4) =8a(5) =16a(6) =30a(7) =58a(8) =110a(9) =209a(10) =397a(11) =753a(12) =1429a(13) =2711a(14) =5143a(15) =9757a(16) =18511a(17) =35117a(18) =66621a(19) =126389a(20) =239781a(21) =454897a(22) =863010a(23) =1637260a(24) =3106138a(25) =5892821a(26) =11179603a(27) =21209446a(28) =40237641a(29) =76337091

External references