Number of (n+2)X3 0..2 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock.

A186560

Number of (n+2)X3 0..2 arrays with every 3X3 subblock commuting with each horizontal and vertical neighbor 3X3 subblock.

Terms

    a(0) =19683a(1) =721a(2) =2917a(3) =6594a(4) =12122a(5) =20056a(6) =29303a(7) =35198a(8) =53611a(9) =85029a(10) =121783a(11) =199305a(12) =321297a(13) =465750a(14) =728568a(15) =1143162a(16) =1676187a(17) =2600987a(18) =4073323a(19) =6071427a(20) =9378717a(21) =14610267a(22) =21959403a(23) =33776511a(24) =52386811a(25) =79228491a(26) =121620695a(27) =188062383

External references