Number of n X n symmetric matrices with nonnegative entries and all row sums 2.
A000985
Number of n X n symmetric matrices with nonnegative entries and all row sums 2.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =11a(4) =56a(5) =348a(6) =2578a(7) =22054a(8) =213798a(9) =2313638a(10) =27627434a(11) =360646314a(12) =5107177312a(13) =77954299144
External references
- oeis: A000985