Number of n-tuples where each entry is chosen from the subsets of {1,2,3} such that the intersection of all n entries is empty.

A128831

Number of n-tuples where each entry is chosen from the subsets of {1,2,3} such that the intersection of all n entries is empty.

Terms

    a(0) =1a(1) =27a(2) =343a(3) =3375a(4) =29791a(5) =250047a(6) =2048383a(7) =16581375a(8) =133432831a(9) =1070599167a(10) =8577357823a(11) =68669157375a(12) =549554511871

External references