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A303861 Number of pairs (lambda,mu) of partitions lambda of 2n and mu of n with mu <= lambda (by diagram containment). 4
1, 2, 8, 23, 70, 178, 479, 1119, 2687, 5960, 13203, 27728, 58293, 117084, 234579, 455637, 878603, 1652382, 3089769, 5654741, 10284636, 18389288, 32649594, 57145095, 99386432, 170658713, 291240275, 491704106, 825049784, 1371281674, 2266239384, 3713251732 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..100

Eric Weisstein's World of Mathematics, Ferrers Diagram

Wikipedia, Ferrers diagram

FORMULA

a(n) = A259478(2n,n) = A303851(2n) = A303852(2n).

CROSSREFS

Bisection (even part) of A303851 and of A303852.

Cf. A259478.

Sequence in context: A018042 A304304 A072842 * A138387 A007346 A062247

Adjacent sequences:  A303858 A303859 A303860 * A303862 A303863 A303864

KEYWORD

nonn

AUTHOR

Alois P. Heinz, May 01 2018

STATUS

approved

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Last modified September 26 16:43 EDT 2020. Contains 337374 sequences. (Running on oeis4.)