Number of pairs of independent nontrivial subsets of a finite set composed of n elements.

A340135

Number of pairs of independent nontrivial subsets of a finite set composed of n elements.

Terms

    a(0) =0a(1) =0a(2) =0a(3) =0a(4) =24a(5) =0a(6) =720a(7) =0a(8) =7000a(9) =15120a(10) =126000a(11) =0a(12) =1777776a(13) =0a(14) =23543520a(15) =55855800a(16) =274565720a(17) =0a(18) =5337775872a(19) =0a(20) =63026049424a(21) =117920013120a(22) =995265791520a(23) =0a(29) =0

External references