Number of 0..2 arrays x(0..n-1) of n elements with each no smaller than the sum of its three previous neighbors modulo 3.

A200662

Number of 0..2 arrays x(0..n-1) of n elements with each no smaller than the sum of its three previous neighbors modulo 3.

Terms

    a(0) =3a(1) =6a(2) =12a(3) =24a(4) =46a(5) =89a(6) =176a(7) =350a(8) =697a(9) =1391a(10) =2780a(11) =5555a(12) =11098a(13) =22170a(14) =44288a(15) =88472a(16) =176729a(17) =353032a(18) =705224a(19) =1408771a(20) =2814203a(21) =5621746a(22) =11230193a(23) =22433834a(24) =44814616a(25) =89523251a(26) =178834811a(27) =357246713a(28) =713648606a(29) =1425609609

External references