1,5
Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.
Cf. A052437, ..., A052440.
Sequence in context: A023920 A198810 A096306 * A025602 A088126 A040327
Adjacent sequences: A052438 A052439 A052440 * A052442 A052443 A052444
nonn,more
Eric Weisstein (eric(AT)weisstein.com)