Number of nX2 1..5 arrays containing at least one of each value, all equal values connected, rows considered as a single number in nondecreasing order, and columns considered as a single number in decreasing order.

A166839

Number of nX2 1..5 arrays containing at least one of each value, all equal values connected, rows considered as a single number in nondecreasing order, and columns considered as a single number in decreasing order.

Terms

    a(0) =0a(1) =0a(2) =55a(3) =478a(4) =2166a(5) =7120a(6) =19219a(7) =45316a(8) =96732a(9) =191232a(10) =355575a(11) =628738a(12) =1065922a(13) =1743456a(14) =2764723a(15) =4267240a(16) =6431032a(17) =9488448a(18) =13735575a(19) =19545414a(20) =27382990a(21) =37822576a(22) =51567219a(23) =69470764a(24) =92562580a(25) =122075200

External references