Number of nX7 0..1 arrays with every element unequal to 0, 1, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A318081
Number of nX7 0..1 arrays with every element unequal to 0, 1, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =21a(1) =30a(2) =54a(3) =132a(4) =272a(5) =699a(6) =1851a(7) =5189a(8) =13410a(9) =35181a(10) =97580a(11) =275205a(12) =756872a(13) =2086377a(14) =5761955a(15) =16140253a(16) =44957087a(17) =125158194a(18) =347644080a(19) =969683273a(20) =2703389580a(21) =7542883228a(22) =21010421289a(23) =58576761369a(24) =163290233781a(25) =455502716598
External references
- oeis: A318081