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A105163 a(n) = (n^3 - 7*n + 12)/6. 11
1, 1, 3, 8, 17, 31, 51, 78, 113, 157, 211, 276, 353, 443, 547, 666, 801, 953, 1123, 1312, 1521, 1751, 2003, 2278, 2577, 2901, 3251, 3628, 4033, 4467, 4931, 5426, 5953, 6513, 7107, 7736, 8401, 9103, 9843, 10622, 11441, 12301, 13203, 14148, 15137, 16171 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

A floretion-generated sequence relating to the sequence "A class of Boolean functions of n variables and rank 2" (among several others- see link "Sequences in Context").

a(n) = A181971(n,3) for n > 2. - Reinhard Zumkeller, Jul 09 2012

a(n) is the number of P-position in 2-modular Nim with n-1 piles. - Tanya Khovanova and Karan Sarkar, Jan 10 2016

LINKS

Table of n, a(n) for n=1..46.

Index entries for linear recurrences with constant coefficients, signature (4,-6,4,-1).

FORMULA

a(n) = A005581(n) + 1

a(n) = C(n+1,n-2)-n+2. - Zerinvary Lajos, Mar 21 2008

Sequence starting (1, 3, 8, 17,...) = binomial transform of [1, 2, 3, 1, 0, 0, 0,...]. - Gary W. Adamson, Apr 24 2008

G.f.: x*(1-3*x+5*x^2-2*x^3)/(1-x)^4. - Colin Barker, Mar 26 2012

a(n) = 2*a(n-1) - a(n-2) + n - 1, for all n in Z. - Gionata Neri, Jul 28 2016

MAPLE

seq(binomial(n+1, n-2)-n+2, n=1..44); # Zerinvary Lajos, Mar 21 2008

PROG

Floretion Algebra Multiplication Program, FAMP Code: 2jescycrokseq[ - .25'i - .25i' - .25'ii' + .25'jj' + .25'kk' + .25'jk' + .25'kj' - .25e] RokType: Y[15] = Y[15] + p, X[15] = X[15] + 1 (internal program code)

(PARI) a(n)=(n^3-7*n)/6+2 \\ Charles R Greathouse IV, Mar 26 2012

(Maxima) A105163(n):=(n^3 - 7*n + 12)/6$ makelist(A105163(n), n, 1, 20); /* Martin Ettl, Dec 18 2012 */

CROSSREFS

Cf. A005581, A102169.

Sequence in context: A033816 A011889 A188426 * A011850 A141422 A076980

Adjacent sequences:  A105160 A105161 A105162 * A105164 A105165 A105166

KEYWORD

nonn,easy

AUTHOR

Creighton Dement, Apr 10 2005

STATUS

approved

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Last modified June 27 11:25 EDT 2017. Contains 288788 sequences.