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A027368
Coordination sequence T4 for Zeolite Code CGS.
1
1, 4, 9, 18, 32, 48, 67, 91, 119, 151, 185, 224, 268, 313, 364, 417, 472, 533, 596, 666, 737, 811, 893, 975, 1065, 1154, 1244, 1344, 1443, 1550, 1656, 1766, 1887, 2004, 2132, 2258, 2385, 2523, 2657, 2803, 2945, 3090, 3248, 3401, 3568, 3729, 3892, 4069
OFFSET
0,2
FORMULA
G.f.: (1 + x) * (1 + x + 2*x^2 + 4*x^3 + 4*x^4 + 3*x^5 + 7*x^6 + 5*x^7 + 7*x^8 + 8*x^9 + 8*x^10 + 8*x^11 + 7*x^12 + 5*x^13 + 7*x^14 + 3*x^15 + 4*x^16 + 4*x^17 + 2*x^18 + x^19 + x^20) / ((1 - x)^3 * (1 + x^2) * (1 - x + x^2 - x^3 + x^4) * (1 - x^2 + x^4) * (1 + x + x^2 + x^3 + x^4)^2). - Colin Barker, Dec 21 2015
CROSSREFS
Sequence in context: A254874 A301146 A027366 * A008266 A301200 A008222
KEYWORD
nonn
STATUS
approved