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

Author

Omar E. Pol, May 24 2012

Keywords

• nonn
• tabf

Comments

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

Examples

			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.

Formula

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