Number of (n+2) X (3+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000101 or 00000111.

A261706

Number of (n+2) X (3+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000001 00000101 or 00000111.

Terms

    a(0) =172a(1) =270a(2) =468a(3) =662a(4) =1168a(5) =2372a(6) =3700a(7) =6158a(8) =11812a(9) =19350a(10) =31112a(11) =58428a(12) =98160a(13) =157340a(14) =290888a(15) =493946a(16) =796540a(17) =1451708a(18) =2482588a(19) =4029944a(20) =7257136a(21) =12470954a(22) =20367532a(23) =36325296a(24) =62623576a(25) =102859784a(26) =181987616a(27) =314402990a(28) =519129804

External references