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A106241 Triangle of coefficients arising in connection with enumeration of series-parallel networks. 1
1, 2, 2, 4, 16, 6, 8, 88, 116, 24, 16, 416, 1312, 888, 120 (list; table; graph; refs; listen; history; internal format)
OFFSET

1,2

REFERENCES

J. Riordan, The blossoming of Schroeder's fourth problem, Acta Math., 137 (1976), 1-16.

EXAMPLE

Triangle begins:

1

2 2

4 16 6

8 88 116 24

CROSSREFS

Sequence in context: A122598 A087783 A176190 * A153991 A153994 A102864

Adjacent sequences:  A106238 A106239 A106240 * A106242 A106243 A106244

KEYWORD

nonn,tabl

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com), May 29 2005

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Last modified February 15 12:13 EST 2012. Contains 205783 sequences.