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A261646 Row lengths in A261644. 5
1, 1, 1, 3, 5, 7, 15, 27, 49, 90, 171, 326, 613, 1174, 2255, 4333, 8386, 16213, 31457, 61097, 118577, 230322, 447767, 870570, 1693887, 3297343, 6423347, 12523562, 24435171, 47707012, 93215393, 182260604, 356622869, 698284551, 1368195878, 2682527954, 5262729874, 10330704931 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

COMMENTS

First differences of A261396;

also row lengths in A261712.

LINKS

Table of n, a(n) for n=1..38.

FORMULA

a(n) = A261396(n) - A261396(n-1).

PROG

(Haskell)

a261646 = length . a261644_row

CROSSREFS

Cf. A261644, A261712, A261396.

Sequence in context: A061950 A166093 A165785 * A303027 A217615 A050553

Adjacent sequences:  A261643 A261644 A261645 * A261647 A261648 A261649

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Aug 31 2015

EXTENSIONS

a(21)-a(38) from Chai Wah Wu, Aug 31 2015

STATUS

approved

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Last modified February 21 04:18 EST 2019. Contains 320371 sequences. (Running on oeis4.)