Number of n X 2 1..6 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 nonincreasing order.

A166828

Number of n X 2 1..6 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 nonincreasing order.

Terms

    a(0) =0a(1) =0a(2) =30a(3) =728a(4) =5364a(5) =24402a(6) =84285a(7) =242793a(8) =614140a(9) =1407960a(10) =2987500a(11) =5953706a(12) =11263472a(13) =20392138a(14) =35552387a(15) =59984019a(16) =98331688a(17) =157130592a(18) =245423322

External references