login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A167751 Diagonal sums of A167749. 2
1, 0, 1, 1, 2, 4, 7, 14, 27, 52, 102, 198, 387, 755, 1474, 2879, 5622, 10982, 21450, 41900, 81847, 159880, 312315, 610086, 1191768, 2328054, 4547732, 8883767, 17354001, 33900200, 66222412, 129362318, 252703135, 493643580, 964309346 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

Hankel transform is A167753.

LINKS

Table of n, a(n) for n=0..34.

FORMULA

G.f.: 1/(1-x^2/(1-x/(1-x^2/(1-x^3/(1-x^4/(1-...)))))) (continued fraction);

G.f.: 1/(1-x^2*f(x)), f(x) the g.f. of A005169.

EXAMPLE

G.f. = 1 + x^2 + x^3 + 2*x^4 + 4*x^5 + 7*x^6 + 14*x^7 + 27*x^8 + 52*x^9 + ...

CROSSREFS

Sequence in context: A001631 A108758 A018085 * A190822 A107949 A155099

Adjacent sequences:  A167748 A167749 A167750 * A167752 A167753 A167754

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Nov 10 2009

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 19 19:06 EST 2020. Contains 332047 sequences. (Running on oeis4.)