Column 3 of table in A067640.

A067643

Column 3 of table in A067640.

Terms

    a(0) =70a(1) =2352a(2) =47820a(3) =784672a(4) =11515714a(5) =158295072a(6) =2086803540a(7) =26737722400a(8) =335676172480

External references