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A202303 Drop the last digit of A023110(n). 6
0, 0, 0, 1, 4, 16, 25, 36, 144, 324, 1849, 6400, 23716, 36481, 51984, 207936, 467856, 2666689, 9229444, 34199104, 52606009, 74960964, 299843856, 674648676, 3845364121, 13308852496, 49315084900, 75857828929, 108093658176, 432374632704, 972842923584, 5545012396225, 19191356070436, 71112318227344, 109386936710041, 155870980128900, 623483920515600, 1402838821160100 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

By definition, all the terms are squares.

REFERENCES

R. K. Guy, Neg and Reg, preprint, Jan 2012.

LINKS

Table of n, a(n) for n=1..38.

FORMULA

Conjecture: a(n) = 1443*a(n-7)-1443*a(n-14)+a(n-21). - Colin Barker, Sep 20 2014

Empirical g.f.: -x^4*(x +1)*(x^16 +3*x^15 +13*x^14 +12*x^13 +312*x^12 -168*x^11 +204*x^10 +202*x^9 +426*x^8 +202*x^7 +204*x^6 +120*x^5 +24*x^4 +12*x^3 +13*x^2 +3*x +1) / ((x -1)*(x^6 +x^5 +x^4 +x^3 +x^2 +x +1)*(x^14 -1442*x^7 +1)). - Colin Barker, Sep 20 2014

CROSSREFS

Cf. A023110. The square roots are in A031150.

Sequence in context: A103052 A228004 A269157 * A214937 A235001 A087055

Adjacent sequences:  A202300 A202301 A202302 * A202304 A202305 A202306

KEYWORD

nonn,base

AUTHOR

N. J. A. Sloane, Jan 12 2012

STATUS

approved

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Last modified May 29 12:34 EDT 2017. Contains 287246 sequences.