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 A061525 Surround numbers of an n X 2 rectangle when n is odd. 1
 83, 361, 951, 1997, 3667, 6153, 9671, 14461, 20787, 28937, 39223, 51981, 67571, 86377, 108807, 135293, 166291, 202281, 243767, 291277, 345363, 406601, 475591, 552957, 639347, 735433, 841911, 959501, 1088947, 1231017, 1386503, 1556221 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS See A061524 for even n. LINKS Table of n, a(n) for n=1..32. E. J. Friedman, Math. Magic: May, 1999 FORMULA a(n) = (n^4 + 32n^3 + 278n^2 + 656n + 361)/16 when n is odd. From Chai Wah Wu, Dec 20 2019: (Start) a(n) = 5*a(n-1) - 10*a(n-2) + 10*a(n-3) - 5*a(n-4) + a(n-5) for n > 5. G.f.: x*(3*x^4 - 22*x^3 + 24*x^2 + 54*x - 83)/(x - 1)^5. (End) CROSSREFS Cf. A047875 A061524. Sequence in context: A031433 A177099 A327850 * A293979 A340861 A160359 Adjacent sequences: A061522 A061523 A061524 * A061526 A061527 A061528 KEYWORD easy,nonn AUTHOR Jason Earls, May 03 2001 EXTENSIONS More terms from Larry Reeves (larryr(AT)acm.org), May 07 2001 STATUS approved

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Last modified May 18 14:46 EDT 2024. Contains 372636 sequences. (Running on oeis4.)