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)