Number of n X 2 1..3 arrays with no element with value z exactly a city block distance of z from another element with value z.

A209368

Number of n X 2 1..3 arrays with no element with value z exactly a city block distance of z from another element with value z.

Terms

    a(0) =8a(1) =39a(2) =84a(3) =129a(4) =178a(5) =338a(6) =722a(7) =1568a(8) =3362a(9) =7200a(10) =15488a(11) =33282a(12) =71442a(13) =153458a(14) =329672a(15) =708050a(16) =1520768a(17) =3266568a(18) =7016258a(19) =15070050a(20) =32369058a(21) =69525632a(22) =149333762a(23) =320753792a(24) =688947200a(25) =1479788802a(26) =3178436450a(27) =6826961250a(28) =14663623752

External references