Number of (n+2) X (3+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00010001.
A260202
Number of (n+2) X (3+2) 0..1 arrays with each 3 X 3 subblock having clockwise perimeter pattern 00000000 00000001 or 00010001.
Terms
- a(0) =106a(1) =207a(2) =685a(3) =1857a(4) =5291a(5) =15715a(6) =45181a(7) =129853a(8) =377479a(9) =1091843a(10) =3153331a(11) =9128061a(12) =26409885a(13) =76369661a(14) =220928809a(15) =639119931a(16) =1848648749a(17) =5347522963a(18) =15468867253a(19) =44745801211a(20) =129434159209a(21) =374410717115
External references
- oeis: A260202