Number of n element 0..2 arrays with each element the minimum of 4 adjacent elements of a random 0..2 array of n+3 elements.

A217879

Number of n element 0..2 arrays with each element the minimum of 4 adjacent elements of a random 0..2 array of n+3 elements.

Terms

    a(0) =3a(1) =9a(2) =22a(3) =46a(4) =86a(5) =153a(6) =274a(7) =511a(8) =993a(9) =1966a(10) =3880a(11) =7558a(12) =14544a(13) =27819a(14) =53226a(15) =102217a(16) =197056a(17) =380656a(18) =735334a(19) =1418931a(20) =2734793a(21) =5267460a(22) =10145106a(23) =19545576a(24) =37670258a(25) =72617646a(26) =139990248a(27) =269844980a(28) =520094648a(29) =1002351809

External references