One third of quartic factorial numbers.

A034176

One third of quartic factorial numbers.

Terms

    a(0) =1a(1) =7a(2) =77a(3) =1155a(4) =21945a(5) =504735a(6) =13627845a(7) =422463195a(8) =14786211825a(9) =576662261175

External references