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 A074703 a(n) = n^2*a(n-1)+1, a(1)=0. 1
 0, 1, 10, 161, 4026, 144937, 7101914, 454522497, 36816322258, 3681632225801, 445477499321922, 64148759902356769, 10841140423498293962, 2124863523005665616553, 478094292676274763724426 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 LINKS Harvey P. Dale, Table of n, a(n) for n = 1..253 FORMULA a(n) = round(n!^2*(BesselI(0, 2)-2)). MATHEMATICA nxt[{n_, a_}]:={n+1, (n+1)^2 a+1}; Transpose[NestList[nxt, {1, 0}, 20]][[2]] (* Harvey P. Dale, Dec 11 2013 *) PROG (PARI) a(n)=round((besseli(0, 2)-2)*n!^2) \\ Charles R Greathouse IV, Feb 19 2014 CROSSREFS Cf. A006040, A073701. Sequence in context: A090374 A034724 A234283 * A190903 A303486 A064747 Adjacent sequences: A074700 A074701 A074702 * A074704 A074705 A074706 KEYWORD easy,nonn AUTHOR Vladeta Jovovic, Sep 03 2002 STATUS approved

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Last modified January 27 09:05 EST 2023. Contains 359838 sequences. (Running on oeis4.)