A202303 Drop the last digit of A023110(n).

0, 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

Offset

1,6

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..39.

Formula

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

Empirical g.f.: -x^5*(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: A228004 A269157 A343726 * A350835 A214937 A235001

Adjacent sequences: A202300 A202301 A202302 * A202304 A202305 A202306

Keyword

nonn,base

Author

N. J. A. Sloane, Jan 12 2012

Extensions

Fourth leading 0 inserted by Georg Fischer, Feb 21 2022

Status

approved