Number of nX4 0..1 arrays with every element equal to 0, 1, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

A302511

Number of nX4 0..1 arrays with every element equal to 0, 1, 4 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =5a(1) =5a(2) =15a(3) =28a(4) =48a(5) =89a(6) =163a(7) =297a(8) =544a(9) =1004a(10) =1848a(11) =3393a(12) =6237a(13) =11481a(14) =21122a(15) =38834a(16) =71418a(17) =131383a(18) =241665a(19) =444451a(20) =817450a(21) =1503590a(22) =2765570a(23) =5086571a(24) =9355603a(25) =17207807a(26) =31650188a(27) =58213496a(28) =107071156a(29) =196935005

External references