0,19

(Product_{i=1..m-1} (1 + x^(4*i-1))) * (1 + x^(2*m-1) is the PoincarĂ© polynomial for O(2m).

H. Weyl, The Classical Groups, Princeton, 1946, see p. 238.

Nathaniel Johnston, Table of n, a(n) for n = 0..231 (full sequence)

a(n) = a(231-n). - Rick L. Shepherd, Mar 02 2013

Sequence in context: A068913 A128306 A305152 * A113423 A131258 A298596

Adjacent sequences: A170980 A170981 A170982 * A170984 A170985 A170986

nonn,fini,full,easy

N. J. A. Sloane, Aug 29 2010

approved