Number of 3 X n arrays containing n copies of 0..3-1 with no element 1 greater than its west or north neighbor modulo 3 and the upper left element equal to 0.
A266319
Number of 3 X n arrays containing n copies of 0..3-1 with no element 1 greater than its west or north neighbor modulo 3 and the upper left element equal to 0.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =30a(4) =114a(5) =414a(6) =1561a(7) =6227a(8) =25712a(9) =107071a(10) =445688a(11) =1860037a(12) =7822241a(13) =33194789a(14) =141813340a(15) =608193866a(16) =2615140082a(17) =11275208902a(18) =48764348038a(19) =211550067336a(20) =920159818053
External references
- oeis: A266319