1,3
Bell numbers (Also called exponential numbers): A000110.
a(n) = B(n)^B(n).
a(4)=3125 because B(4)=5 and we can write 3125=5^5 or 3125=5*5*5*5*5.
Cf. A000110.
Sequence in context: A066837 A172953 A132639 * A079193 A134908 A114498
Adjacent sequences: A132640 A132641 A132642 * A132644 A132645 A132646
nonn
Omar E. Pol (info(AT)polprimos.com), Aug 25 2007
