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 A112958 a(1) = a(2) = a(3) = a(4) = 1; for n>1: a(n+4) = a(n)^2 + a(n+1)^2 + a(n+2)^2 + a(n+3)^2. 6
 1, 1, 1, 1, 4, 19, 379, 144019, 20741616379, 430214650034342688004, 185084645104171955001009752069374428191659 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS A quadratic tetranacci sequence. This is to A000283 as a tetranacci (A000288) is to Fibonacci. Primes in this begin 19, 379. LINKS Seiichi Manyama, Table of n, a(n) for n = 1..15 EXAMPLE 1^2 + 4^2 + 19^2 + 379^2 = 144019. MATHEMATICA RecurrenceTable[{a[1] == a[2] == a[3] == a[4] == 1, a[n] == a[n-1]^2 + a[n-2]^2 + a[n-3]^2 + a[n-4]^2}, a, {n, 15}] (* Vincenzo Librandi, Aug 21 2016 *) CROSSREFS Cf. A000283, A000288, A112957, A112959, A112960. Sequence in context: A007411 A276259 A072879 * A080991 A000844 A000863 Adjacent sequences:  A112955 A112956 A112957 * A112959 A112960 A112961 KEYWORD easy,nonn AUTHOR Jonathan Vos Post, Jan 02 2006 STATUS approved

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Last modified August 5 00:15 EDT 2021. Contains 346456 sequences. (Running on oeis4.)