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 A304918 Number of labeled antichain hyperforests spanning a subset of {1,...,n}. 6
 1, 2, 5, 18, 104, 943, 12133, 203038, 4177755, 101922814, 2874725600, 92009680557, 3294276613933, 130446181101044, 5660055256165565, 267044522107706072, 13611243187516647324, 745329728016955480687, 43636132793651444511809, 2719977663069107176768790 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..19. FORMULA Binomial transform of A134954. EXAMPLE The a(3) = 18 hyperforests are the following: {{1,2,3}} {{2,3}} {{1,3}} {{1,2}} {{3}} {{2}} {{1}} {} {{1,3},{2,3}} {{2},{3}} {{1},{3}} {{1},{2}} {{1,2},{2,3}} {{1,2},{1,3}} {{3},{1,2}} {{2},{1,3}} {{1},{2,3}} {{1},{2},{3}} CROSSREFS Cf. A030019, A035053, A048143, A134954, A134955, A134957, A134956, A134957, A134959, A144959, A303838, A304716, A304717, A304867, A304911, A304912. Sequence in context: A005639 A093730 A366449 * A007769 A174122 A005805 Adjacent sequences: A304915 A304916 A304917 * A304919 A304920 A304921 KEYWORD nonn AUTHOR Gus Wiseman, May 21 2018 STATUS approved

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Last modified August 4 23:59 EDT 2024. Contains 374934 sequences. (Running on oeis4.)