The boustrophedon (``ox-plowing'') transform **b** of a sequence **a** is given by

(1) | |||

(2) |

for , where is a Secant Number or Tangent Number defined by

(3) |

(4) |

(5) |

**References**

Millar, J.; Sloane, N. J. A.; and Young, N. E. ``A New Operation on Sequences: The Boustrophedon Transform.''
*J. Combin. Th. Ser. A* **76**, 44-54, 1996.

© 1996-9

1999-05-26