Number of (n+1) X (4+1) 0..3 arrays with every 2 X 2 subblock summing to 6 and no 2 X 2 subblock having exactly two nonzero entries.
A251232
Number of (n+1) X (4+1) 0..3 arrays with every 2 X 2 subblock summing to 6 and no 2 X 2 subblock having exactly two nonzero entries.
Terms
- a(0) =966a(1) =1870a(2) =3886a(3) =8686a(4) =20490a(5) =50570a(6) =129378a(7) =340782a(8) =918878a(9) =2525262a(10) =7049658a(11) =19942026a(12) =57058610a(13) =164910430a(14) =480976574a(15) =1414571198a(16) =4192696714a(17) =12517386890a(18) =37626434786a(19) =113828691374a(20) =346430157502
External references
- oeis: A251232