Number of n X 3 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 0 0 vertically.

A207495

Number of n X 3 0..1 arrays avoiding 0 0 0 and 0 1 1 horizontally and 0 0 1 and 1 0 0 vertically.

Terms

    a(0) =6a(1) =36a(2) =102a(3) =297a(4) =932a(5) =2974a(6) =9723a(7) =32164a(8) =107568a(9) =362291a(10) =1226924a(11) =4170948a(12) =14218841a(13) =48567776a(14) =166128066a(15) =568812225a(16) =1948947544a(17) =6681079858a(18) =22911053867a(19) =78586955264a(20) =269607037796a(21) =925049643523

External references