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

A207094

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

Terms

    a(0) =3a(1) =6a(2) =12a(3) =26a(4) =55a(5) =115a(6) =239a(7) =498a(8) =1038a(9) =2162a(10) =4502a(11) =9375a(12) =19523a(13) =40655a(14) =84659a(15) =176292a(16) =367107a(17) =764456a(18) =1591886a(19) =3314907a(20) =6902887a(21) =14374415a(22) =29932954a(23) =62331700a(24) =129798109a(25) =270288619a(26) =562842849a(27) =1172051097a(28) =2440652442a(29) =5082358916

External references