1,5
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Cf. A052446, ..., A052448.
Sequence in context: A161937 A074621 A185758 * A168502 A127610 A085228
Adjacent sequences: A052445 A052446 A052447 * A052449 A052450 A052451
nonn,more
Eric Weisstein (eric(AT)weisstein.com)