Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001011.

A260497

Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00001011.

Terms

    a(0) =464a(1) =683a(2) =1756a(3) =3603a(4) =4471a(5) =9616a(6) =22405a(7) =32471a(8) =59657a(9) =140464a(10) =237023a(11) =401358a(12) =895127a(13) =1674616a(14) =2821566a(15) =5828888a(16) =11523967a(17) =20018500a(18) =38881704a(19) =78134880a(20) =141071185a(21) =264423367a(22) =527316978a(23) =983256731a(24) =1819268820a(25) =3565771490

External references