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A032081 Shifts left under "BHJ" (reversible, identity, labeled) transform. 0
1, 1, 1, 4, 20, 220, 2020, 26310, 332410, 5189380, 83623310, 1551800020, 30389755640, 659473386920, 15190156196820, 379169061066320, 10036224774532890, 283940562045261940, 8488369128461080030 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

Table of n, a(n) for n=1..19.

CROSSREFS

Sequence in context: A215873 A066917 A280078 * A034235 A352412 A222655

Adjacent sequences:  A032078 A032079 A032080 * A032082 A032083 A032084

KEYWORD

nonn,eigen

AUTHOR

Christian G. Bower

STATUS

approved

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Last modified May 22 13:12 EDT 2022. Contains 353950 sequences. (Running on oeis4.)