

A257352


G.f.: (12*x+51*x^2)/(1x)^3.


7



1, 1, 51, 151, 301, 501, 751, 1051, 1401, 1801, 2251, 2751, 3301, 3901, 4551, 5251, 6001, 6801, 7651, 8551, 9501, 10501, 11551, 12651, 13801, 15001, 16251, 17551, 18901, 20301, 21751, 23251, 24801, 26401, 28051, 29751, 31501, 33301
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OFFSET

0,3


COMMENTS

An example of a quadratic sequence for which the continued square root map (see A257574) produces the number 2. There are infinitely many sequences with this property  another example is A028387.


LINKS

Table of n, a(n) for n=0..37.
Popular Computing (Calabasas, CA), The CSR Function, Vol. 4 (No. 34, Jan 1976), pages PC3410 to PC3411. Annotated and scanned copy.
Herman P. Robinson, The CSR Function, Popular Computing (Calabasas, CA), Vol. 4 (No. 35, Feb 1976), pages PC353 to PC354. Annotated and scanned copy.
Index entries for linear recurrences with constant coefficients, signature (3,3,1).


PROG

(PARI) a(n)=25*n^225*n+1 \\ Charles R Greathouse IV, Jun 17 2017


CROSSREFS

Cf. A257574. A028387.
Sequence in context: A044683 A044383 A044764 * A008883 A069762 A245829
Adjacent sequences: A257349 A257350 A257351 * A257353 A257354 A257355


KEYWORD

nonn,easy


AUTHOR

N. J. A. Sloane, May 03 2015


STATUS

approved



