Number of (n+1) X (3+1) 0..2 arrays with every 2 X 2 subblock summing to 4 and no 2 X 2 subblock having exactly two nonzero entries.

A251144

Number of (n+1) X (3+1) 0..2 arrays with every 2 X 2 subblock summing to 4 and no 2 X 2 subblock having exactly two nonzero entries.

Terms

    a(0) =53a(1) =87a(2) =143a(3) =247a(4) =433a(5) =777a(6) =1413a(7) =2607a(8) =4863a(9) =9167a(10) =17433a(11) =33417a(12) =64493a(13) =125207a(14) =244303a(15) =478727a(16) =941473a(17) =1857097a(18) =3672373a(19) =7277087a(20) =14444703a(21) =28712287a(22) =57137993a(23) =113812297a(24) =226874333a(25) =452534727a(26) =903105263a(27) =1803032407a(28) =3600922513

External references