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
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
KEYWORD
nonn
AUTHOR
Peter Kagey, Apr 12 2020
STATUS
approved