Number of 0..3 arrays x(0..n-1) of n elements with each no smaller than the sum of its three previous neighbors modulo 4.

A200663

Number of 0..3 arrays x(0..n-1) of n elements with each no smaller than the sum of its three previous neighbors modulo 4.

Terms

    a(0) =4a(1) =10a(2) =26a(3) =69a(4) =175a(5) =432a(6) =1076a(7) =2671a(8) =6627a(9) =16421a(10) =40695a(11) =100886a(12) =250093a(13) =619947a(14) =1536810a(15) =3809790a(16) =9444489a(17) =23412999a(18) =58041252a(19) =143885484a(20) =356695266a(21) =884255363a(22) =2192088651a(23) =5434237397a(24) =13471597487a(25) =33396394603a(26) =82790419927a(27) =205239329905

External references