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!)
A123641 Triangular array related to sequence A123640 with row sum A001045. 4
1, 0, 1, 1, 0, 2, 0, 1, 0, 4, 1, 0, 2, 0, 8, 0, 1, 0, 4, 0, 16, 1, 0, 2, 0, 8, 0, 32, 0, 1, 0, 4, 0, 16, 0, 64, 1, 0, 2, 0, 8, 0, 32, 0, 128, 0, 1, 0, 4, 0, 16, 0, 64, 0, 256, 1, 0, 2, 0, 8, 0, 32, 0, 128, 0, 512, 0, 1, 0, 4, 0, 16, 0, 64, 0, 256, 0, 1024, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

Table of n, a(n) for n=1..79.

EXAMPLE

For n>0 A123640 begins

1

0 1

1 0 1 1

0 1 0 0 1 1 1 1

suppressing multiple zeros and counting contiguous ones yields

1

0 1

1 0 2

0 1 0 4

1 0 2 0 8

0 1 0 4 0 16

...

PROG

(PARI) a001045(n)=(2^n-(-1)^n)/3;

lista(nn) = {last = v[2]; nb = 1; s = 0; j = 1; for (i=3, nn, if ((v[i] == last) && (s+v[i] < a001045(j)), nb++; s += v[i]; , if (last, w = nb, w = 0); print1(w, ", "); nb = 1; last = v[i]; if (s + v[i] >= a001045(j), s = 0; j++; , s += v[i]; ); ); ); } \\ Michel Marcus, Feb 09 2014

CROSSREFS

Cf. A000079, A001045, A059841, A123640.

Sequence in context: A155761 A067631 A134317 * A217377 A276193 A238618

Adjacent sequences:  A123638 A123639 A123640 * A123642 A123643 A123644

KEYWORD

nonn,tabl

AUTHOR

Alford Arnold, Oct 04 2006

EXTENSIONS

More terms from Michel Marcus, Feb 09 2014

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 September 24 17:29 EDT 2021. Contains 347651 sequences. (Running on oeis4.)