1,8
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Sequence in context: A014512 A065606 A005501 this_sequence A050549 A167144 A159483
Adjacent sequences: A049369 A049370 A049371 this_sequence A049373 A049374 A049375
nonn,nice,hard
Brendan McKay (bdm(AT)cs.anu.edu.au)
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