Number of nX2 0..3 arrays with no element equal to one 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 or one plus the sum of the elements antidiagonally to its northeast, modulo 4.
A241278
Number of nX2 0..3 arrays with no element equal to one 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 or one plus the sum of the elements antidiagonally to its northeast, modulo 4.
Terms
- a(0) =3a(1) =3a(2) =9a(3) =36a(4) =139a(5) =532a(6) =2111a(7) =8473a(8) =34053a(9) =136880a(10) =550213a(11) =2211810a(12) =8891567a(13) =35744766a(14) =143696235a(15) =577666729a(16) =2322248891a(17) =9335550407a(18) =37529342193a(19) =150869654682a(20) =606502776180
External references
- oeis: A241278