Number of nX4 0..1 arrays with every element equal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

A300368

Number of nX4 0..1 arrays with every element equal to 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

Terms

    a(0) =0a(1) =1a(2) =3a(3) =3a(4) =4a(5) =22a(6) =39a(7) =102a(8) =298a(9) =833a(10) =2105a(11) =6065a(12) =16665a(13) =45374a(14) =126224a(15) =348868a(16) =962054a(17) =2662783a(18) =7364465a(19) =20366371a(20) =56334291a(21) =155844294a(22) =431150954a(23) =1192657061a(24) =3299782775a(25) =9128883051a(26) =25255840216a(27) =69873935349a(28) =193313945656a(29) =534830511278

External references