A339299 - OEIS

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A339299

Number of essentially series oriented series-parallel networks with n labeled elements and without multiple unit elements in parallel.

0, 2, 6, 72, 840, 14040, 276360, 6494880, 175452480, 5375311200, 183962227680, 6958070380800, 288200792880000, 12974113884251520, 630742839699772800, 32933429270386444800, 1838083950894102912000, 109201772719684867622400, 6880730833827011402841600

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

See A339301 for additional details.

LINKS

Table of n, a(n) for n=1..19.

FORMULA

E.g.f.: P(x)^2/(1 - P(x)) where P(x) is the e.g.f. of A339300.

E.g.f.: B(x)^2/(1 + B(x)) where B(x) is the e.g.f. of A339301.

E.g.f.: B(log(1+x)) where x + B(x) is the e.g.f. of A058349.

PROG