Number of nX3 1..3 arrays containing at least one of each value, and all equal values connected.

A166762

Number of nX3 1..3 arrays containing at least one of each value, and all equal values connected.

Terms

    a(0) =6a(1) =174a(2) =1548a(3) =8100a(4) =32208a(5) =108456a(6) =327042a(7) =912330a(8) =2403570a(9) =6063738a(10) =14792208a(11) =35140296a(12) =81722988a(13) =186803940a(14) =420988854a(15) =937659294a(16) =2067934782a(17) =4522786278a(18) =9821642100a(19) =21198358092a(20) =45510675048a(21) =97254168192a(22) =206980215882

External references