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 A176788 a(n) = (0!! + 1!! + 2!! + 3!! + ... + (n-1)!!) mod n. 2
 0, 0, 1, 3, 0, 0, 1, 7, 0, 2, 6, 3, 12, 10, 12, 3, 13, 6, 11, 7, 3, 8, 14, 15, 12, 22, 15, 3, 19, 12, 16, 11, 30, 14, 17, 15, 17, 34, 9, 7, 26, 24, 36, 19, 42, 8, 2, 3, 24, 12, 48, 35, 2, 42, 52, 31, 15, 22, 51, 27, 32, 56, 24, 27, 22, 30, 6, 31, 54, 52, 12, 15, 7, 56, 12, 15, 52, 48 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 LINKS FORMULA a(n) = A129981(n-1) mod n. EXAMPLE 0!! mod 1 = 1 mod 1 = 0. (0!!+1!!) mod 2 = (1 + 1) mod 2 = 0. (0!!+1!!+2!!) mod 3 = (1 + 1 + 2) mod 3 = 1. MAPLE A176788 := proc(n)         A129981(n-1) mod n ; end proc: # R. J. Mathar, Jul 13 2012 CROSSREFS Cf. A049782, A176787, A176789. Sequence in context: A080159 A144299 A060514 * A238129 A212221 A193291 Adjacent sequences:  A176785 A176786 A176787 * A176789 A176790 A176791 KEYWORD easy,nonn AUTHOR Paolo P. Lava & Giorgio Balzarotti, Apr 26 2010 STATUS approved

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Last modified August 17 11:14 EDT 2019. Contains 326057 sequences. (Running on oeis4.)