Number of nX4 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 neighboring 1s.
A296323
Number of nX4 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 2 neighboring 1s.
Terms
- a(0) =1a(1) =8a(2) =23a(3) =61a(4) =185a(5) =562a(6) =1677a(7) =4998a(8) =14968a(9) =44818a(10) =134061a(11) =401123a(12) =1200360a(13) =3591843a(14) =10747770a(15) =32160619a(16) =96234620a(17) =287963368a(18) =861674203a(19) =2578393448a(20) =7715343389a(21) =23086669802a(22) =69082386936a(23) =206715662599a(24) =618556579000
External references
- oeis: A296323