An upper diagonal of table A122888.

A122887

An upper diagonal of table A122888.

Terms

    a(0) =1a(1) =10a(2) =118a(3) =1656a(4) =27326a(5) =520626a(6) =11271436a(7) =273613032a(8) =7365210840a(9) =217823497200

External references