Number of nX2 0..3 arrays with no element equal to one plus the sum of elements to its left or three plus the sum of elements above it or zero plus the sum of the elements diagonally to its northwest, modulo 4.
A240401
Number of nX2 0..3 arrays with no element equal to one plus the sum of elements to its left or three 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) =5a(2) =14a(3) =24a(4) =77a(5) =182a(6) =397a(7) =1164a(8) =2626a(9) =6439a(10) =17045a(11) =39465a(12) =100175a(13) =251538a(14) =602316a(15) =1525842a(16) =3756635a(17) =9193532a(18) =23052218a(19) =56571408a(20) =139814332a(21) =347712483a(22) =855278021a(23) =2119654735a(24) =5248572774a(25) =12946151193a(26) =32079791328a(27) =79306295913a(28) =195965663917
External references
- oeis: A240401