login
A174382
T(1,0)=0 and for n > 1, T(n,k) is the number of k's in rows 1 to n - 1.
4
0, 1, 1, 1, 1, 3, 1, 4, 0, 1, 2, 6, 0, 1, 1, 3, 8, 1, 1, 1, 0, 1, 4, 12, 1, 2, 1, 0, 1, 0, 1, 6, 16, 2, 2, 2, 0, 1, 0, 1, 0, 0, 0, 1, 11, 19, 5, 2, 2, 0, 2, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 19, 22, 8, 2, 2, 1, 2, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 1, 27, 28, 11, 2, 2, 1, 2, 0, 2, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0, 2
OFFSET
1,6
COMMENTS
Construction as in A333867 but starting with a 0 and including a count of 0s at the start of each row. [Edited by Peter Munn, Oct 11 2022]
See A342585 for a similarly defined sequence that has been analyzed more and has lists of other related sequences. - Peter Munn, Oct 08 2022
LINKS
EXAMPLE
0;
1; # one zero
1,1; # one zero, one one
1,3; # one zero, three ones
1,4,0,1; # one zero, four ones, zero twos, one three
PROG
(Haskell)
import Data.List (sort, group)
a174382 n k = a174382_tabf !! (n-1) !! k
a174382_row n = a174382_tabf !! (n-1)
a174382_tabf = iterate f [0] where
f xs = g (xs ++ [0, 0 ..]) [0..] (map head zs) (map length zs)
where g _ _ _ [] = []
g (u:us) (k:ks) hs'@(h:hs) vs'@(v:vs)
| k == h = u + v : g us ks hs vs
| k /= h = u : g us ks hs' vs'
zs = group $ sort xs
-- Reinhard Zumkeller, Apr 06 2014
CROSSREFS
Cf. A240508 (row lengths).
Sequence in context: A110790 A119719 A125162 * A123730 A143317 A130540
KEYWORD
easy,nonn,tabf,look
AUTHOR
STATUS
approved