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

A251145

Number of (n+1) X (4+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) =107a(1) =161a(2) =247a(3) =401a(4) =667a(5) =1141a(6) =1987a(7) =3521a(8) =6327a(9) =11521a(10) =21227a(11) =39541a(12) =74387a(13) =141201a(14) =270167a(15) =520561a(16) =1009147a(17) =1966581a(18) =3849507a(19) =7563681a(20) =14908407a(21) =29462561a(22) =58351947a(23) =115776501a(24) =230052467a(25) =457677041a(26) =911425687a(27) =1816495121a(28) =3622705627

External references