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A036655 Numbers d_n used in recurrence for series-parallel numbers. 2
1, 2, 2, 6, 2, 18, 2, 46, 14, 126, 2, 454, 2, 1266, 134, 4222, 2, 14202, 2, 46406, 1274, 155502, 2, 531790, 122, 1792810, 13802, 6126334, 2, 21032794, 2, 72121854, 155510, 248396798, 1382, 857944150, 2, 2964896882, 1792818, 10269600622 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

J. Riordan, An Introduction to Combinatorial Analysis, foot of p. 141.

LINKS

Table of n, a(n) for n=0..39.

FORMULA

G.f.: S'*(1-S)/(1+S), where S = g.f. for A000084.

CROSSREFS

Sequence in context: A057562 A102628 A211776 * A098792 A061057 A038667

Adjacent sequences:  A036652 A036653 A036654 * A036656 A036657 A036658

KEYWORD

nonn,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified November 21 11:17 EST 2014. Contains 249777 sequences.