OFFSET
0,2
COMMENTS
a(n) is the number of bicolored graphs on 2n unlabeled nodes with an equal number of each color. Adjacent vertices may have the same color.
LINKS
Andrew Howroyd, Table of n, a(n) for n = 0..25
FORMULA
a(n) = A361404(2*n, n).
PROG
(PARI) a(n) = row(2*n)[n+1] \\ row(n) defined in A361404.
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Mar 11 2023
STATUS
approved