A057313 Coordination sequence T2 for Zeolite Code SAS.

1, 4, 9, 17, 30, 48, 68, 87, 109, 142, 184, 224, 255, 287, 338, 406, 470, 515, 555, 620, 712, 802, 865, 915, 992, 1104, 1218, 1301, 1365, 1456, 1586, 1720, 1821, 1901, 2010, 2160, 2312, 2427, 2521, 2650, 2824, 2996, 3123, 3227, 3374, 3574, 3770, 3911

Offset: 0

Author

Ralf W. Grosse-Kunstleve

Keywords

• nonn

Links

• R. W. Grosse-Kunstleve, Table of n, a(n) for n = 0..1000
• R. W. Grosse-Kunstleve, Coordination Sequences and Encyclopedia of Integer Sequences
• Sean A. Irvine, Generating Functions for Coordination Sequences of Zeolites, after Grosse-Kunstleve, Brunner, and Sloane
• International Zeolite Association, Database of Zeolite Structures

Formula

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