Number of (n+1) X (6+1) 0..2 arrays with every 2 X 2 subblock summing to 4 and no 2 X 2 subblock having exactly two nonzero entries.

A251147

Number of (n+1) X (6+1) 0..2 arrays with every 2 X 2 subblock summing to 4 and no 2 X 2 subblock having exactly two nonzero entries.

Terms

    a(0) =427a(1) =565a(2) =777a(3) =1141a(4) =1743a(5) =2763a(6) =4491a(7) =7453a(8) =12569a(9) =21501a(10) =37255a(11) =65355a(12) =116035a(13) =208469a(14) =378889a(15) =696357a(16) =1293471a(17) =2426507a(18) =4593563a(19) =8767469a(20) =16856057a(21) =32613805a(22) =63450647a(23) =124026251a(24) =243400723a(25) =479274853a(26) =946371561a(27) =1873038613a(28) =3714194799

External references