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A173310 Partial sums of A005470. 0
1, 2, 4, 8, 19, 52, 194, 1016, 7982, 87835, 1228751, 19909759 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Partial sums of number of unlabeled planar simple graphs with n nodes. The subsequence of primes begins: 2, 19, 19909759.

LINKS

Table of n, a(n) for n=0..11.

FORMULA

a(n) = SUM[i=0..n] A005470(i).

EXAMPLE

a(11) = 1 + 1 + 2 + 4 + 11 + 33 + 142 + 822 + 6966 + 79853 + 1140916 + 18681008 = 19909759 is prime.

CROSSREFS

Cf. A005470, A003094 (connected planar graphs), A034889, A039735 (planar graphs by nodes and edges).

Sequence in context: A100133 A099598 A269023 * A320178 A128816 A006897

Adjacent sequences:  A173307 A173308 A173309 * A173311 A173312 A173313

KEYWORD

hard,nonn

AUTHOR

Jonathan Vos Post, Feb 16 2010

STATUS

approved

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Last modified June 5 16:19 EDT 2020. Contains 334852 sequences. (Running on oeis4.)