Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west, northwest or southwest neighbor modulo 3 and the upper left element equal to 0.
A266826
Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its north, west, northwest or southwest neighbor modulo 3 and the upper left element equal to 0.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =4a(4) =10a(5) =25a(6) =45a(7) =120a(8) =399a(9) =1108a(10) =2923a(11) =7991a(12) =21953a(13) =61747a(14) =176646a(15) =499952a(16) =1409762a(17) =3999661a(18) =11391786a(19) =32574598a(20) =93459471a(21) =268336007a(22) =771070140a(23) =2219952037a(24) =6403510478a(25) =18502345737a(26) =53538515559a(27) =155090741041a(28) =449731074131
External references
- oeis: A266826