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A008250
Coordination sequence T2 for Banalsite.
1
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
OFFSET
0,2
REFERENCES
Inorganic Crystal Structure Database: Collection Code 4447.
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
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: A008079 A301045 A008090 * A306262 A099074 A014818
KEYWORD
nonn,easy
STATUS
approved