Number of n X 5 binary arrays with each 1 adjacent to exactly two other 1s.

A183326

Number of n X 5 binary arrays with each 1 adjacent to exactly two other 1s.

Terms

    a(0) =1a(1) =6a(2) =19a(3) =72a(4) =289a(5) =996a(6) =3325a(7) =11415a(8) =39720a(9) =138689a(10) =483837a(11) =1682961a(12) =5845649a(13) =20310166a(14) =70604782a(15) =245504404a(16) =853649448a(17) =2967979455a(18) =10318546476a(19) =35873587105a(20) =124720541039a(21) =433616480871

External references