Number of 3 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s.

A297596

Number of 3 X n 0..1 arrays with every 1 horizontally, diagonally or antidiagonally adjacent to 1 or 5 neighboring 1s.

Terms

    a(0) =1a(1) =9a(2) =25a(3) =49a(4) =145a(5) =443a(6) =1141a(7) =3009a(8) =8455a(9) =23151a(10) =62211a(11) =169651a(12) =464469a(13) =1262947a(14) =3434407a(15) =9364725a(16) =25517397a(17) =69467533a(18) =189209921a(19) =515479315a(20) =1403998341a(21) =3823905513a(22) =10415880295a(23) =28371283095a(24) =77275911315a(25) =210482481315

External references