Number of n X n 0..1 arrays with every element equal to 0 or 1 horizontally or antidiagonally adjacent elements, with upper left element zero.

A301785

Number of n X n 0..1 arrays with every element equal to 0 or 1 horizontally or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =1a(1) =5a(2) =12a(3) =32a(4) =82a(5) =205a(6) =508a(7) =1258a(8) =3129a(9) =7837a(10) =19782a(11) =50310a(12) =128803a(13) =331592a(14) =857434a(15) =2224726a(16) =5787130a(17) =15082283a(18) =39360630a(19) =102820286a(20) =268777679a(21) =702935723a(22) =1839002254a(23) =4812250428a(24) =12594535285a(25) =32965703404a(26) =86292668280a(27) =225894991484

External references