Number of length n+3 0..3 arrays with at most one downstep in every n consecutive neighbor pairs.

A258733

Number of length n+3 0..3 arrays with at most one downstep in every n consecutive neighbor pairs.

Terms

    a(0) =256a(1) =840a(2) =2028a(3) =4184a(4) =7834a(5) =13720a(6) =22866a(7) =36656a(8) =56925a(9) =86064a(10) =127140a(11) =184032a(12) =261584a(13) =365776a(14) =503914a(15) =684840a(16) =919163a(17) =1219512a(18) =1600812a(19) =2080584a(20) =2679270a(21) =3420584a(22) =4331890a(23) =5444608a(24) =6794649a(25) =8422880a(26) =10375620a(27) =12705168a(28) =15470364

External references