Number of graphical partitions (degree-vectors for simple graphs with n vertices, or possible ordered row-sum vectors for a symmetric 0-1 matrix with diagonal values 0).
A004251
Number of graphical partitions (degree-vectors for simple graphs with n vertices, or possible ordered row-sum vectors for a symmetric 0-1 matrix with diagonal values 0).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =4a(4) =11a(5) =31a(6) =102a(7) =342a(8) =1213a(9) =4361a(10) =16016a(11) =59348a(12) =222117a(13) =836315a(14) =3166852a(15) =12042620a(16) =45967479a(17) =176005709a(18) =675759564a(19) =2600672458a(20) =10029832754a(21) =38753710486a(22) =149990133774a(23) =581393603996
External references
- oeis: A004251