Number of nX4 0..1 arrays with every element equal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A300431
Number of nX4 0..1 arrays with every element equal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =2a(1) =15a(2) =33a(3) =87a(4) =238a(5) =697a(6) =1942a(7) =5656a(8) =16487a(9) =48053a(10) =140187a(11) =410230a(12) =1200987a(13) =3516338a(14) =10303811a(15) =30218936a(16) =88682815a(17) =260386129a(18) =764851328a(19) =2247357212a(20) =6604868430a(21) =19414622795a(22) =57075791496a(23) =167812063057a(24) =493440845883
External references
- oeis: A300431