Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.

A260837

Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00000011 or 00010101.

Terms

    a(0) =364a(1) =496a(2) =1224a(3) =2235a(4) =2590a(5) =6232a(6) =13170a(7) =17731a(8) =34192a(9) =77780a(10) =123488a(11) =206695a(12) =457440a(13) =825256a(14) =1336836a(15) =2725379a(16) =5298108a(17) =8851516a(18) =16674798a(19) =33192375a(20) =58277638a(21) =104857040a(22) =206110260a(23) =377809047a(24) =671142648a(25) =1283474236a(26) =2413960656

External references