Number of nX2 1..5 arrays containing at least one of each value, and all equal values connected.

A166758

Number of nX2 1..5 arrays containing at least one of each value, and all equal values connected.

Terms

    a(0) =0a(1) =0a(2) =840a(3) =13320a(4) =99720a(5) =495720a(6) =1889760a(7) =5967360a(8) =16358640a(9) =40158000a(10) =90215640a(11) =188431320a(12) =370311480a(13) =691081560a(14) =1233676080a(15) =2118959760a(16) =3518563680a(17) =5670751200a(18) =8899759080a(19) =13639089960a(20) =20459263080a(21) =30100560840a(22) =43511339520

External references