1,4
A string and its reverse are considered to be equivalent.
M. R. Nester (1999). Mathematical investigations of some plant interaction designs. PhD Thesis. University of Queensland, Brisbane, Australia.
A032121(n)-4*A032120(n)+6*A005418(n+1)-4.
Cf. A032121.
Sequence in context: A001816 A133386 A056320 this_sequence A009050 A067358 A061506
Adjacent sequences: A056308 A056309 A056310 this_sequence A056312 A056313 A056314
nonn
Marks R. Nester (nesterm(AT)dpi.qld.gov.au)
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