A029584 Expansion of cos x + tan x + sec x.

2, 1, 0, 2, 6, 16, 60, 272, 1386, 7936, 50520, 353792, 2702766, 22368256, 199360980, 1903757312, 19391512146, 209865342976, 2404879675440, 29088885112832, 370371188237526, 4951498053124096, 69348874393137900

Offset: 0

Author

N. J. A. Sloane

Keywords

• nonn

Comments

a(2n) = 2*A012007(n), a(2n+1) = A000182(n+1).

Links

• Harvey P. Dale, Table of n, a(n) for n = 0..485

Programs

Mathematica

With[{nn=30},CoefficientList[Series[Cos[x]+Tan[x]+Sec[x],{x,0,nn}],x] Range[0,nn]!] (* Harvey P. Dale, Jun 09 2025 *)