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A341218
a(n) is the number of numbers k such that A340873(k) = n.
3
1, 1, 1, 2, 3, 4, 6, 8, 11, 15, 21, 29, 40, 54, 74, 102, 139, 189, 259, 355, 486, 664, 908, 1242, 1697, 2317, 3165, 4326, 5911, 8076, 11034, 15073, 20588, 28125, 38415, 52477, 71692, 97931, 133774, 182739, 249634, 341013, 465839, 636346, 869279, 1187486
OFFSET
0,4
FORMULA
a(n) <= a(n+1) <= 2*a(n).
EXAMPLE
The first terms, alongside the correspond k's, are:
n a(n) k's
- ---- ----------------------
0 1 1
|
1 1 2
|
2 1 4
/ \
3 2 3 8
/ / \
4 3 6 7 16
/ / / \
5 4 12 14 15 32
PROG
(PARI) See Links section.
CROSSREFS
Sequence in context: A095814 A006683 A014213 * A064323 A003411 A034081
KEYWORD
nonn,base
AUTHOR
Rémy Sigrist, Feb 07 2021
STATUS
approved