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, modulo 4.
A240407
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, modulo 4.
Terms
- a(0) =2a(1) =10a(2) =33a(3) =139a(4) =529a(5) =2105a(6) =8258a(7) =32480a(8) =127944a(9) =503372a(10) =1982058a(11) =7801697a(12) =30716039a(13) =120917541a(14) =476048890a(15) =1874110143a(16) =7378197850a(17) =29046994153a(18) =114354774523a(19) =450201581068
External references
- oeis: A240407