A210692 Number of parts that are visible in one of the three views of the shell model of partitions with n regions mentioned in A210991.

1, 3, 6, 6, 11, 11, 18, 18, 18, 18, 29, 29, 29, 29, 44, 44, 44, 44, 44, 44, 44, 66, 66, 66, 66, 66, 66, 66, 66, 96, 96, 96, 96, 96, 96, 96, 96, 96, 96, 96, 96, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 194, 194, 194, 194, 194, 194, 194, 194, 194, 194, 194, 194, 194, 194, 194

Offset

1,2

Comments

For the definition of "regions of n" see A206437.

Links

Table of n, a(n) for n=1..70.

Formula

a(A000041(n)) = A026905(n).

Example

Written as a triangle begins:
1,
3,
6,
6, 11,
11,18,
18,18,18,29,
29,29,29,44,
44,44,44,44,44,44,66,
66,66,66,66,66,66,66,96,
96,96,96,96,96,96,96,96,96,96,96,138;

Crossrefs

Row j has length A187219(j). Right border gives A026905.

Cf. A000041, A135010, A138121, A182703, A186114, A194803, A194805, A206437, A210991.

Sequence in context: A203330 A197442 A113497 * A158662 A119980 A066779

Adjacent sequences: A210689 A210690 A210691 * A210693 A210694 A210695

Keyword

nonn,tabf

Author

Omar E. Pol, May 24 2012

Status

approved