Number of n-element 0..2 arrays with each element the minimum of 3 adjacent elements of a random 0..2 array of n+2 elements.

A217878

Number of n-element 0..2 arrays with each element the minimum of 3 adjacent elements of a random 0..2 array of n+2 elements.

Terms

    a(0) =3a(1) =9a(2) =22a(3) =46a(4) =91a(5) =183a(6) =383a(7) =819a(8) =1749a(9) =3699a(10) =7772a(11) =16316a(12) =34325a(13) =72349a(14) =152573a(15) =321621a(16) =677623a(17) =1427389a(18) =3006930a(19) =6335210a(20) =13348399a(21) =28125235a(22) =59258363a(23) =124851495a(24) =263048937a(25) =554220135a(26) =1167698552a(27) =2460253944a(28) =5183565225a(29) =10921353721

External references