login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A154603 Binomial transform of reduced tangent numbers (A002105). 1
1, 1, 2, 4, 11, 31, 110, 400, 1757, 7861, 41402, 220540, 1358183, 8405203, 59340710, 418689544, 3335855897, 26440317193, 234747589106, 2065458479476, 20224631361251, 195625329965671, 2094552876276830, 22092621409440256 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

COMMENTS

Hankel transform is A154604.

FORMULA

G.f: 1/(1-x-x^2/(1-x-3x^2/(1-x-6x^2/(1-x-10x^2/(1-x-15x^2..... (continued fraction);

E.g.f.: exp(x)*(sec(x/sqrt(2))^2;

CROSSREFS

Sequence in context: A115625 A056323 A081557 * A063254 A123443 A123427

Adjacent sequences:  A154600 A154601 A154602 * A154604 A154605 A154606

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Jan 12 2009

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 15 05:44 EST 2012. Contains 205694 sequences.