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

 

Logo

Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing.
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A169941 Triangle read by rows: A169940 with rows reversed. 0
1, 1, 1, 1, 0, 3, 1, 1, 3, 3, 1, 0, 6, 4, 5, 1, 1, 6, 10, 7, 7, 1, 0, 9, 6, 27, 8, 13, 1, 1, 9, 17, 23, 41, 21, 15, 1, 0, 12, 8, 56, 34, 98, 20, 27, 1, 1, 12, 22, 50, 104, 96, 148, 53, 25, 1, 0, 15, 10, 96, 66, 294, 116, 325, 56, 45, 1, 1, 15, 27, 86, 184, 262, 518, 319 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..75.

Index entries for sequences related to carryless arithmetic

FORMULA

Wanted: a recurrence. Are any of A169940-A169954 related to any other entries in the OEIS?

EXAMPLE

Triangle begins:

[1]

[1, 1]

[1, 0, 3]

[1, 1, 3, 3]

[1, 0, 6, 4, 5]

[1, 1, 6, 10, 7, 7]

[1, 0, 9, 6, 27, 8, 13]

[1, 1, 9, 17, 23, 41, 21, 15]

[1, 0, 12, 8, 56, 34, 98, 20, 27]

[1, 1, 12, 22, 50, 104, 96, 148, 53, 25]

[1, 0, 15, 10, 96, 66, 294, 116, 325, 56, 45]

[1, 1, 15, 27, 86, 184, 262, 518, 319, 487, 89, 59]

[1, 0, 18, 12, 143, 112, 608, 346, 1279, 434, 942, 112, 89]

[1, 1, 18, 32, 131, 291, 528, 1166, 1153, 2181, 1042, 1348, 197, 103]

[1, 0, 21, 14, 199, 168, 1083, 720, 3313, 1568, 4981, 1320, 2613, 220, 163]

...

CROSSREFS

Related to thickness: A169940-A169954, A061909.

Sequence in context: A184831 A033989 A307501 * A099545 A300867 A269301

Adjacent sequences:  A169938 A169939 A169940 * A169942 A169943 A169944

KEYWORD

nonn,tabl

AUTHOR

N. J. A. Sloane, Aug 01 2010

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 9 09:21 EST 2019. Contains 329877 sequences. (Running on oeis4.)