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A091356 Number of planar partitions of n with exactly 2 rows. 4
1, 2, 5, 9, 18, 30, 53, 85, 139, 215, 336, 504, 760, 1115, 1635, 2351, 3375, 4770, 6725, 9368, 13006, 17885, 24510, 33319, 45139, 60743, 81457, 108610, 144334, 190844, 251542, 330082, 431825, 562710, 731154, 946644, 1222305, 1573155, 2019471 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Table of n, a(n) for n=2..40.

FORMULA

a(n) = A000990(n)-A000041(n).

CROSSREFS

Column 2 of A091355. Cf. A000219, A091357-A091360.

Sequence in context: A184353 A019135 A069957 * A107705 A278690 A002883

Adjacent sequences:  A091353 A091354 A091355 * A091357 A091358 A091359

KEYWORD

nonn

AUTHOR

Christian G. Bower, Jan 02 2004

STATUS

approved

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Last modified December 8 16:27 EST 2016. Contains 278946 sequences.