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

A207095

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

Terms

    a(0) =4a(1) =10a(2) =26a(3) =68a(4) =176a(5) =458a(6) =1193a(7) =3103a(8) =8069a(9) =20982a(10) =54556a(11) =141854a(12) =368847a(13) =959072a(14) =2493770a(15) =6484280a(16) =16860367a(17) =43840173a(18) =113992823a(19) =296403114a(20) =770704718a(21) =2003979505a(22) =5210729566a(23) =13548892363a(24) =35229708616a(25) =91603972925a(26) =238187830252

External references