Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 or 00000001.

A259638

Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 or 00000001.

Terms

    a(0) =133a(1) =365a(2) =1483a(3) =4146a(4) =12348a(5) =42524a(6) =133078a(7) =406770a(8) =1313046a(9) =4180198a(10) =13059524a(11) =41407226a(12) =131557812a(13) =414760302a(14) =1310911640a(15) =4153427590a(16) =13129841142a(17) =41501667938a(18) =131324101864a(19) =415367424944

External references