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A032056 Shifts left under "BGJ" (reversible, element, labeled) transform. 0
1, 1, 1, 4, 8, 38, 326, 2160, 14092, 119776, 1726772, 17087084, 202819128, 2671905592, 43460010864, 653865234996, 10669423514948, 193608386667944, 3712432320889004, 73424512657548576 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..20.

CROSSREFS

Sequence in context: A032138 A032151 A032042 * A214535 A228755 A007215

Adjacent sequences:  A032053 A032054 A032055 * A032057 A032058 A032059

KEYWORD

nonn,eigen

AUTHOR

Christian G. Bower

STATUS

approved

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Last modified February 20 07:01 EST 2018. Contains 299358 sequences. (Running on oeis4.)