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A320488
Inverse Euler transform of A004104.
1
1, 1, 0, 1, 4, 14, 65, 572, 7434, 163284, 5736792, 342169618, 33534958026, 5442700283638, 1484664947481018, 664513607618098252, 508538464299684269212, 635542752091150346032474, 1374528064543284187245552390, 4842758246111267151697826493193, 29772724415959420224886585241636839
OFFSET
0,5
COMMENTS
The inverse Euler transform of A004104 does not give the number of connected self-dual signed graphs. The combinatorial interpretation of this sequence is that of either a connected self-dual signed graph or a pair of distinct connected signed graphs which are dual to each other (but not self-dual). - Andrew Howroyd, Jan 26 2020
LINKS
N. J. A. Sloane, Transforms
CROSSREFS
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Oct 25 2018
EXTENSIONS
Definition edited by Andrew Howroyd, Jan 26 2020
STATUS
approved