Number of n X n symmetric binary matrices with no row sum greater than 2.
A139678
Number of n X n symmetric binary matrices with no row sum greater than 2.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =45a(4) =315a(5) =2634a(6) =25518a(7) =280257a(8) =3434595a(9) =46400310a(10) =684374076a(11) =10933866027a(12) =187983528813
External references
- oeis: A139678