Number of 4 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 neighboring 1s.

A297434

Number of 4 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 2 neighboring 1s.

Terms

    a(0) =1a(1) =4a(2) =22a(3) =42a(4) =105a(5) =349a(6) =1057a(7) =2834a(8) =8216a(9) =24556a(10) =71651a(11) =207409a(12) =608985a(13) =1791636a(14) =5251548a(15) =15401954a(16) =45271039a(17) =133066199a(18) =390990659a(19) =1149260888a(20) =3379206474a(21) =9935995300a(22) =29215600841a(23) =85913309363a(24) =252656693545a(25) =743030170284

External references