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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A089940 Triangle read by rows: T(n,k)=binomial(n+k,floor((n-k)/2)) 1
1, 1, 1, 2, 1, 1, 3, 4, 1, 1, 6, 5, 6, 1, 1, 10, 15, 7, 8, 1, 1, 20, 21, 28, 9, 10, 1, 1, 35, 56, 36, 45, 11, 12, 1, 1, 70, 84, 120, 55, 66, 13, 14, 1, 1, 126, 210, 165, 220, 78, 91, 15, 16, 1, 1, 252, 330, 495, 286, 364, 105, 120, 17, 18, 1, 1, 462, 792, 715, 1001, 455, 560, 136, 153 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..73.

CROSSREFS

Columns include A001405, A037955, A037956, A037957. Row sums are A089941.

Sequence in context: A210341 A160449 A326322 * A331598 A123974 A238350

Adjacent sequences:  A089937 A089938 A089939 * A089941 A089942 A089943

KEYWORD

easy,nonn,tabl

AUTHOR

Paul Barry, Nov 16 2003

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 December 4 06:49 EST 2021. Contains 349476 sequences. (Running on oeis4.)