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a(n) = A240857(2*n,n) = A046818(n) - 1.
Reinhard Zumkeller, Table of n, a(n) for n = 0..10000
a240883 n = a240857 (2 * n) n
Sequence in context: A272328 A239703 A029338 * A048272 A112329 A117448
Adjacent sequences: A240880 A240881 A240882 * A240884 A240885 A240886
Reinhard Zumkeller, Apr 14 2014