A387104 Split A386482 into maximal runs of consecutive decreasing terms; a(n) is the length of the n-th run.

1, 1, 1, 2, 1, 3, 2, 3, 3, 1, 6, 2, 3, 2, 10, 3, 5, 3, 5, 13, 3, 1, 2, 25, 2, 1, 3, 1, 1, 6, 7, 1, 3, 12, 4, 2, 33, 1, 1, 10, 6, 1, 11, 29, 51, 23, 10, 48, 61, 24, 26, 168, 1, 2, 2, 9, 1, 3, 2, 7, 2, 2, 6, 104, 15, 2, 1, 1, 2, 3, 3, 1, 1, 4, 11, 5, 159, 9, 1

Offset

1,4

Links

Rémy Sigrist, Table of n, a(n) for n = 1..10000

Rémy Sigrist, PARI program

Formula

A387103(1 + Sum_{k = 1..n} a(k)) = 0 for any n > 0.

Example

The first terms, alongside the corresponding runs, are:
  n   a(n)  Corresponding run
  --  ----  --------------------------------------
   1     1  1
   2     1  2
   3     1  4
   4     2  6, 3
   5     1  9
   6     3  12, 10, 8
   7     2  14, 7
   8     3  21, 18, 16
   9     3  20, 15, 5
  10     1  25
  11     6  30, 28, 26, 24, 22, 11
  12     2  33, 27
  13     3  36, 34, 32
  14     2  38, 19
  15    10  57, 54, 52, 50, 48, 46, 44, 42, 40, 35
  16     3  45, 39, 13

Prog

(PARI) \\ See Links section.

Crossrefs

Cf. A386482, A387103.

Sequence in context: A121842 A317963 A219609 * A087825 A263100 A261388

Adjacent sequences: A387101 A387102 A387103 * A387105 A387106 A387107

Keyword

nonn

Author

Rémy Sigrist, Aug 16 2025

Status

approved