Number of n X 2 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.
A240266
Number of n X 2 0..3 arrays with no element equal to zero plus the sum of elements to its left or one plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.
Terms
- a(0) =4a(1) =7a(2) =14a(3) =36a(4) =72a(5) =170a(6) =411a(7) =879a(8) =2106a(9) =4874a(10) =10808a(11) =25648a(12) =58383a(13) =132428a(14) =310199a(15) =704308a(16) =1615735a(17) =3746472a(18) =8529529a(19) =19647966a(20) =45277950a(21) =103456016a(22) =238430432a(23) =547803553a(24) =1255188579a(25) =2890336834a(26) =6633676274a(27) =15225374578a(28) =35023723614
External references
- oeis: A240266