Number of 3 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 neighboring 1.

A297396

Number of 3 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 neighboring 1.

Terms

    a(0) =1a(1) =9a(2) =19a(3) =37a(4) =127a(5) =323a(6) =763a(7) =2121a(8) =5557a(9) =14031a(10) =37065a(11) =97027a(12) =250371a(13) =653707a(14) =1706245a(15) =4431885a(16) =11544027a(17) =30085525a(18) =78290135a(19) =203852347a(20) =530958219a(21) =1382353401a(22) =3599332477a(23) =9373032927a(24) =24405570561a(25) =63547912011a(26) =165475162027a(27) =430875964651

External references