Number of free polyforms made of T-pipes connected end-to-end (not perpendicular).
A390515
Number of free polyforms made of T-pipes connected end-to-end (not perpendicular).
Terms
- a(0) =1a(1) =4a(2) =15a(3) =99a(4) =630a(5) =4599a(6) =34099a(7) =261603a(8) =2036026a(9) =16075980a(10) =128214840a(11) =1031495768
External references
- oeis: A390515