1,16
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Sequence in context: A126700 A076593 A129774 * A002536 A068981 A099631
Adjacent sequences: A049370 A049371 A049372 * A049374 A049375 A049376
nonn,nice,hard
Brendan McKay (bdm(AT)cs.anu.edu.au)