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A008250 Coordination sequence T2 for Banalsite. 0
1, 4, 11, 24, 42, 65, 97, 135, 176, 221, 277, 337, 400, 469, 547, 629, 716, 807, 907, 1013, 1122, 1235, 1359, 1487, 1618, 1755, 1901, 2051, 2206, 2365, 2533, 2707, 2884, 3065, 3257, 3453, 3652, 3857, 4071, 4289, 4512, 4739, 4975, 5217, 5462, 5711, 5971 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

REFERENCES

Inorganic Crystal Structure Database: Collection Code 4447.

LINKS

Table of n, a(n) for n=0..46.

R. W. Grosse-Kunstleve, Coordination Sequences and Encyclopedia of Integer Sequences

FORMULA

a(12*m+k) = 408*m^2 + 68*k*m + one of 12 numbers depending on k, 0<=k<12. - N. J. A. Sloane

Empirical g.f.: (1+3*x+7*x^2+12*x^3+14*x^4+13*x^5+12*x^6+8*x^7+3*x^8-3*x^9-x^10-x^11) / ((1-x)^3*(1+x)*(1+x^2)*(1+x+x^2)). - Colin Barker, Dec 20 2015

CROSSREFS

Sequence in context: A008259 A008079 A008090 * A099074 A014818 A006527

Adjacent sequences:  A008247 A008248 A008249 * A008251 A008252 A008253

KEYWORD

nonn,easy

AUTHOR

R. W. Grosse-Kunstleve (rwgk(AT)cci.lbl.gov)

STATUS

approved

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Last modified February 21 22:56 EST 2018. Contains 299427 sequences. (Running on oeis4.)