A355806 a(n) is the number of odd terms in n-th row of triangle A355802.

1, 2, 2, 2, 2, 4, 4, 4, 6, 8, 8, 8, 6, 8, 10, 8, 10, 12, 12, 16, 14, 12, 10, 16, 16, 12, 18, 20, 16, 20, 18, 16, 22, 20, 20, 24, 26, 24, 26, 24, 24, 28, 26, 24, 30, 36, 32, 32, 22, 32, 34, 24, 34, 36, 28, 40, 38, 28, 34, 40, 32, 36, 42, 36, 42, 44, 36, 40, 46

Offset

0,2

Links

Rémy Sigrist, Table of n, a(n) for n = 0..8191

Rémy Sigrist, Illustration of the odd terms among the first 2^9 rows of triangle A355802

Rémy Sigrist, PARI program

Example

The first terms, alongside the corresponding rows in A355802, are:
  n  a(n)  n-th row of A355802
  -  ----  ------------------------------
  0     1  [1]
  1     2  [1, 1]
  2     2  [1, 2, 1]
  3     2  [1, 2, 2, 1]
  4     2  [1, 2, 2, 2, 1]
  5     4  [1, 2, 3, 3, 2, 1]
  6     4  [1, 2, 3, 4, 3, 2, 1]
  7     4  [1, 2, 3, 4, 4, 3, 2, 1]
  8     6  [1, 2, 3, 5, 6, 5, 3, 2, 1]
  9     8  [1, 2, 3, 5, 7, 7, 5, 3, 2, 1]

Prog

(PARI) See Links section.

Crossrefs

Cf. A355802.

Sequence in context: A104409 A274144 A214628 * A032576 A276420 A239494

Adjacent sequences: A355803 A355804 A355805 * A355807 A355808 A355809

Keyword

nonn

Author

Rémy Sigrist, Jul 18 2022

Status

approved