Number of nX2 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 zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.
A241392
Number of nX2 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 zero plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.
Terms
- a(0) =2a(1) =5a(2) =13a(3) =28a(4) =64a(5) =142a(6) =318a(7) =726a(8) =1634a(9) =3695a(10) =8363a(11) =18904a(12) =42787a(13) =96771a(14) =218940a(15) =495514a(16) =1121224a(17) =2537388a(18) =5742666a(19) =12996786a(20) =29415660a(21) =66576728a(22) =150686121a(23) =341060866a(24) =771951453a(25) =1747237409a(26) =3954724092a(27) =8951198975a(28) =20260385570a(29) =45857968649
External references
- oeis: A241392