A177451 Partial sums of A054595.

1, 4, 26, 281, 3602, 56550, 1121538, 26193063, 693887458, 20808594004, 699641607622, 26001947464541, 1059148042622186, 47015706166302146, 2260884753582320442, 117153802097975691651, 6513779162975806691634

Offset

3,2

Comments

Partial sums of number of labeled 2-connected minimally 2-edge-connected graphs by nodes. The only prime in the partial sum values shown is 281.

Links

Table of n, a(n) for n=3..19.

Formula

a(n) = SUM[i=3..n] A054595(i).

Example

a(6) = 1 + 3 + 22 + 255 = 281 is prime.

Crossrefs

Cf. A054595, A054317, A001072, A054596.

Sequence in context: A079473 A145164 A113078 * A304864 A167811 A156306

Adjacent sequences: A177448 A177449 A177450 * A177452 A177453 A177454

Keyword

nonn

Author

Jonathan Vos Post, May 09 2010

Status

approved