Number of n X 2 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.
A240322
Number of n X 2 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.
Terms
- a(0) =2a(1) =5a(2) =17a(3) =37a(4) =80a(5) =213a(6) =443a(7) =1028a(8) =2511a(9) =5370a(10) =12742a(11) =29737a(12) =65687a(13) =155443a(14) =355668a(15) =803696a(16) =1883007a(17) =4285398a(18) =9805203a(19) =22760901a(20) =51853646a(21) =119272787a(22) =275149593a(23) =628629688a(24) =1447871151a(25) =3328934761a(26) =7625189365a(27) =17555754237a(28) =40308328871
External references
- oeis: A240322