OFFSET
0,5
COMMENTS
Inverse Euler transform of A219889.
The Multiset Transform (number of loopless 2-regular digraphs on n nodes with c weakly connected components) of this sequence starts
in row 3 as:
1 ;
2 ;
5 ;
22 , 1 ;
90 , 2 ;
616 , 8 ;
4988 , 32 , 1 ;
46883 , 149 , 2 ;
493406 , 906 , 8 ;
5712809 , 6923 , 36 , 1 ;
71909602 , 61919 , 164 , 2 ;
CROSSREFS
KEYWORD
nonn
AUTHOR
R. J. Mathar, Mar 27 2019
STATUS
approved