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A225178 The generalized Conway-Guy sequence d_2(n). 1
1, 2, 6, 16, 48, 140, 408, 1224, 3640, 10824, 32192, 96576, 288912, 864288, 2585584, 7735104, 23205312, 69551552, 208461504, 624806688, 1872691488, 5612903296, 16838709888, 50500659456, 151455567744, 454227600128, 1362265877376 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

REFERENCES

Bae, Jaegug; Choi, Sungjin. A generalization of a subset-sum-distinct sequence. J. Korean Math. Soc. 40 (2003), no. 5, 757--768. MR1996839 (2004d:05198). See b(n).

LINKS

Table of n, a(n) for n=1..27.

FORMULA

Bae and Choi define this sequence via a collection of recurrences.

MAPLE

b := proc(n)

    round(sqrt(2*n-2)) ;

end proc:

d := proc(k, n)

    option remember;

    if n = 1 then

        1;

    else

        add( k*procname(k, i), i=n-b(n)..n-1 ) ;

    end if;

end proc:

A225178 := proc(n)

    d(2, n) ;

end proc: # R. J. Mathar, Jul 09 2013

CROSSREFS

Cf. A005318, A005230, A002024.

Sequence in context: A064190 A151281 A045694 * A129772 A046721 A230929

Adjacent sequences:  A225175 A225176 A225177 * A225179 A225180 A225181

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, May 02 2013

STATUS

approved

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Last modified October 17 14:50 EDT 2018. Contains 316281 sequences. (Running on oeis4.)