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A334001 The number of odd values in the n-th column of A279212. 2
2, 2, 4, 4, 6, 8, 8, 10, 10, 12, 16, 12, 16, 14, 18, 12, 22, 24, 20, 16, 22, 22, 24, 26, 22, 26, 28, 16, 30, 30, 36, 24, 34, 36, 32, 30, 30, 44, 42, 44, 38, 44, 50, 34, 44, 46, 54, 36, 50, 60, 56, 30, 50, 56, 56, 46, 54, 56, 68, 36, 68, 54, 56, 46, 44, 66, 54 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All of the values in this sequence are even, as shown in Alec Jones's proof that each column of A279212 has a finite number of odd entries.

Conjecture: a(n) <= 2*n.

LINKS

Peter Kagey, Table of n, a(n) for n = 1..1024

Alec Jones, Proof that columns of A279212 have finitely many odd entries.

Peter Kagey, Bitmap showing parity of first 1024 rows and 512 columns of A269212. (Odd values are white; even values are black.)

EXAMPLE

For n = 3, the third column of A279212 is 11, 39, 119, 330, 870, 2209, 5454, 13176, 31280, 73200, ... which contains a(3) = 4 odd values.

CROSSREFS

Cf. A279212.

Sequence in context: A218897 A218064 A352227 * A341731 A183002 A211859

Adjacent sequences:  A333998 A333999 A334000 * A334002 A334003 A334004

KEYWORD

nonn

AUTHOR

Peter Kagey, Apr 12 2020

STATUS

approved

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Last modified May 28 18:24 EDT 2022. Contains 354122 sequences. (Running on oeis4.)