Number of 2 X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 or 2 neighboring 1s.

A297315

Number of 2 X n 0..1 arrays with every 1 horizontally or antidiagonally adjacent to 1 or 2 neighboring 1s.

Terms

    a(0) =1a(1) =7a(2) =23a(3) =66a(4) =207a(5) =654a(6) =2049a(7) =6422a(8) =20119a(9) =63033a(10) =197551a(11) =619096a(12) =1940007a(13) =6079365a(14) =19051015a(15) =59700283a(16) =187082905a(17) =586262278a(18) =1837172149a(19) =5757153010a(20) =18041210871a(21) =56535805498a(22) =177166451873a(23) =555187134041

External references