Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001001.

A260243

Number of (n+2)X(3+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000101 or 00001001.

Terms

    a(0) =256a(1) =551a(2) =1476a(3) =3287a(4) =8242a(5) =22944a(6) =56634a(7) =134576a(8) =355620a(9) =930398a(10) =2243778a(11) =5643712a(12) =14874838a(13) =37124894a(14) =91485986a(15) =236607962a(16) =604605716a(17) =1496818690a(18) =3791471588a(19) =9741618048a(20) =24444280948a(21) =61293997138a(22) =156547740090a(23) =396868734430

External references