Number of 2 X n 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of the elements above it or one plus the sum of the elements diagonally to its northwest or one plus the sum of the elements antidiagonally to its northeast, modulo 4.
A239859
Number of 2 X n 0..3 arrays with no element equal to zero plus the sum of elements to its left or zero plus the sum of the elements above it or one 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) =3a(2) =9a(3) =12a(4) =29a(5) =63a(6) =100a(7) =215a(8) =468a(9) =785a(10) =1654a(11) =3515a(12) =6048a(13) =12676a(14) =26381a(15) =46460a(16) =96810a(17) =198286a(18) =355994a(19) =737992a(20) =1493159a(21) =2724777a(22) =5619409a(23) =11263131a(24) =20836948a(25) =42752798a(26) =85081916a(27) =159218104a(28) =325067366a(29) =643478067
External references
- oeis: A239859