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1, 4, 12, 40, 120, 396, 1260, 4176, 13788, 46240, 155496, 527160, 1792804, 6125028, 20986020, 72117632, 248396792, 857402748, 2964896876, 10269550040, 35622420288, 123727866768, 430254861944, 1497796242288, 5219231003500
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,2
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REFERENCES
| Z. A. Lomnicki, Two-terminal series-parallel networks, Adv. Appl. Prob., 4 (1972), 109-150.
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CROSSREFS
| Cf. A000084, A006349, A006350, A058351, A058352, A000669.
Sequence in context: A149331 A009532 A056274 * A104525 A126986 A090576
Adjacent sequences: A058350 A058351 A058352 * A058354 A058355 A058356
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Dec 16 2000
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