Number of nX2 0..1 arrays with every element equal to 0, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A300533

Number of nX2 0..1 arrays with every element equal to 0, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =3a(2) =5a(3) =16a(4) =40a(5) =113a(6) =304a(7) =833a(8) =2270a(9) =6194a(10) =16900a(11) =46103a(12) =125787a(13) =343166a(14) =936250a(15) =2554294a(16) =6968726a(17) =19012299a(18) =51870004a(19) =141513486a(20) =386081850a(21) =1053321508a(22) =2873707154a(23) =7840144587a(24) =21389746215a(25) =58356225385a(26) =159209417569a(27) =434360490031

External references