Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its west, northeast or northwest neighbor modulo 3 and the upper left element equal to 0.
A266995
Number of 3Xn arrays containing n copies of 0..3-1 with no element 1 greater than its west, northeast or northwest neighbor modulo 3 and the upper left element equal to 0.
Terms
- a(0) =2a(1) =2a(2) =2a(3) =2a(4) =2a(5) =5a(6) =14a(7) =44a(8) =127a(9) =325a(10) =779a(11) =1794a(12) =3988a(13) =8830a(14) =19835a(15) =45596a(16) =108019a(17) =262831a(18) =649761a(19) =1616713a(20) =4017231a(21) =9918784a(22) =24298996a(23) =59106476a(24) =143053467a(25) =345488183a(26) =834978807a(27) =2023884377a(28) =4926308772a(29) =12044390597
External references
- oeis: A266995