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 A283260 Product of the products of elements of all the nonempty subsets of the sets of numbers from 1 to n. 1
 1, 4, 1296, 110075314176, 1848842588950364160000000000000000, 27204445973673520186989292010512474445356561349778469394841600000000000000000000000000000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS a(7) has 237 digits. LINKS N. J. A. Sloane, Table of n, a(n) for n = 1..8 FORMULA a(n) = (n!)^(2^(n-1)). EXAMPLE Rows with nonempty subsets of the sets of numbers from 1 to n: {1}; {1}, {2}, {1, 2}; {1}, {2}, {3}, {1, 2}, {1, 3}, {2, 3}, {1, 2, 3}; ... Rows with the products of elements of these subsets: 1; 1, 2, 2; 1, 2, 3, 2, 3, 6, 6; ... a(1) = (1), a(2) = (1*2*2) = 4, a(3) = (1*2*3*2*3*6*6) = 1296, ... PROG (PARI) a(n)=n!^2^(n-1) \\ Charles R Greathouse IV, Mar 06 2017 CROSSREFS Cf. A000225, A001788, A033312, A067174, A229338, A283261. Sequence in context: A324299 A227850 A079711 * A217601 A172925 A167071 Adjacent sequences: A283257 A283258 A283259 * A283261 A283262 A283263 KEYWORD nonn,easy AUTHOR Jaroslav Krizek, Mar 04 2017 STATUS approved

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Last modified December 2 19:27 EST 2023. Contains 367526 sequences. (Running on oeis4.)