Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001001.

A259955

Number of (n+2) X (1+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001001.

Terms

    a(0) =34a(1) =67a(2) =155a(3) =353a(4) =808a(5) =1884a(6) =4340a(7) =9925a(8) =22799a(9) =52515a(10) =120848a(11) =277830a(12) =638728a(13) =1468871a(14) =3378335a(15) =7769445a(16) =17866796a(17) =41087200a(18) =94488464a(19) =217296769a(20) =499716771a(21) =1149192279a(22) =2642787772a(23) =6077609506a(24) =13976655996a(25) =32142038875a(26) =73916854091

External references