A006349 Related to series-parallel networks. (Formerly M3834)

1, 5, 13, 45, 121, 413, 1261, 4221, 13801, 46365, 155497, 527613, 1792805, 6126293, 20986153, 72121853, 248396793, 857416949, 2964896877, 10269596445, 35622421561, 123728022269, 430254861945, 1497796774077, 5219231003621

Offset

1,2

References

Z. A. Lomnicki, Two-terminal series-parallel networks, Adv. Appl. Prob., 4 (1972), 109-150.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

Table of n, a(n) for n=1..25.

Formula

A058352(n) + n*A000084(n).

Crossrefs

Cf. A000084, A006350, A058351, A058352, A058353, A000669.

Sequence in context: A218926 A360798 A113835 * A322203 A052899 A147200

Adjacent sequences: A006346 A006347 A006348 * A006350 A006351 A006352

Keyword

nonn

Author

N. J. A. Sloane.

Status

approved