Column 1 of triangle A132870 (first 30 terms only).

A132873

Column 1 of triangle A132870 (first 30 terms only).

Terms

    a(0) =1a(1) =4a(2) =45a(3) =1432a(4) =101725a(5) =12938076a(6) =2559100705a(7) =721024536688

External references