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

A127509

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

Terms

    a(0) =3a(1) =27a(2) =147a(3) =675a(4) =2883a(5) =11907a(6) =48387a(7) =195075a(8) =783363a(9) =3139587a(10) =12570627a(11) =50307075a(12) =201277443a(13) =805208067a(14) =3221028867a(15) =12884508675a(16) =51538821123a(17) =206156857347a(18) =824630575107

External references