A229942 Number of exposed toothpick endpoints in the n-th row of the toothpick structure of A229940 (also A229950).

0, 1, 2, 2, 2, 2, 2, 3, 3, 2, 3, 4, 3, 2, 3, 4, 3, 3, 4, 4, 3, 2, 4, 6, 4, 2, 3, 4, 4, 4, 4, 5, 4, 2, 4, 6, 4, 2, 4, 6, 5, 4, 4, 4, 3, 2, 5, 8, 5, 3, 4, 4, 4, 4, 5, 6, 4, 2, 5, 8, 5, 2, 4, 6, 5, 4, 4, 4, 4, 4, 6, 9, 6, 2, 3, 4, 4, 4, 6, 8, 5, 2, 5, 8, 5, 2

Offset

1,3

Comments

The second bisection gives A000005.

For more information see A229940.

Links

Table of n, a(n) for n=1..86.

Omar E. Pol, Illustration of initial terms of the divisor function (A000005), see the third picture.

N. J. A. Sloane, Catalog of Toothpick and Cellular Automata Sequences in the OEIS

Index entries for sequences related to toothpick sequences

Example

Illustration of initial terms:
---------------------------------------------------
A229940           Diagram      n   a(n)    A000005
---------------------------------------------------
.                              1    0
.                              2    1         1
1;                 |           3    2
0;                             4    2         2
1;                 |           5    2
0;                             6    2         2
1;                 |           7    2
0;                             8    3         3
1, 1;              | |         9    3
0, 1;                |        10    2         2
1, 1;              | |        11    3
0, 0;                         12    4         4
1, 1;              | |        13    3
0, 1;                |        14    2         2
1, 1;              | |        15    3
0, 0;                         16    4         4
1, 1;              | |        17    3
0, 1;                |        18    3         3
1, 1, 1;           | | |      19    4
0, 0, 1;               |      20    4         4
1, 1, 1;           | | |      21    3
0, 1, 1;             | |      22    2         2
1, 1, 1;           | | |      23    4
0, 0, 0;                      24    6         6
1, 1, 1;           | | |      25    4
0, 1, 1;             | |      26    2         2
1, 1, 1;           | | |      27    3
0, 0, 1;               |      28    4         4
1, 1, 1;           | | |      29    4
0, 1, 0;             |        30    4         4
1, 1, 1;           | | |      31    4
0, 0, 1;               |      32    5         5
1, 1, 1, 1;        | | | |
---------------------------------------------------

Crossrefs

Cf. A000005, A139250, A139251, A229940, A229950, A229951.

Sequence in context: A234287 A084294 A067752 * A025422 A078640 A006374

Adjacent sequences: A229939 A229940 A229941 * A229943 A229944 A229945

Keyword

nonn

Author

Omar E. Pol, Oct 04 2013

Status

approved