1/6 the number of (n+2)X7 0..2 arrays with each 3X3 subblock containing one of one value, four of another, and four of the last.
A184473
1/6 the number of (n+2)X7 0..2 arrays with each 3X3 subblock containing one of one value, four of another, and four of the last.
Terms
- a(0) =45585a(1) =62213a(2) =86575a(3) =127689a(4) =247879a(5) =520289a(6) =1219455a(7) =3727073a(8) =11454631a(9) =35847321a(10) =132023695a(11) =462435665a(12) =1581583095a(13) =6139850633a(14) =22407327775a(15) =78976349889a(16) =312058001959
External references
- oeis: A184473