Number of nX3 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 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.
A240042
Number of nX3 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 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) =4a(1) =9a(2) =26a(3) =93a(4) =309a(5) =1043a(6) =3597a(7) =12865a(8) =45491a(9) =163686a(10) =584594a(11) =2103512a(12) =7548847a(13) =27174662a(14) =97768996a(15) =352008043a(16) =1267200666a(17) =4563053012a(18) =16431815183a(19) =59173883901a(20) =213095423135a(21) =767419010967
External references
- oeis: A240042