A125700 Number of connected categories with n more morphisms than objects.

1, 3, 15, 77, 494, 4068

Offset: 0

Author

Franklin T. Adams-Watters and Christian G. Bower, Jan 05 2007

Keywords

• nonn
• hard
• more

Links

• Eric Weisstein's World of Mathematics, Category

Crossrefs

Cf. A125696, A125699, A125701.

Formula

a(n) = Sum_{k=1..n+1} A125699(n+k,k).

Extensions

a(4)-a(5) from Ben Spitz, Aug 30 2023