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A301141
Coordination sequence T2 for Zeolite Code NSI.
1
1, 4, 12, 26, 43, 64, 99, 133, 161, 210, 274, 318, 364, 441, 528, 593, 649, 746, 877, 953, 1003, 1145, 1314, 1383, 1450, 1629, 1822, 1911, 1979, 2179, 2433, 2524, 2569, 2831, 3132, 3199, 3260, 3568, 3894, 3980, 4033, 4363, 4767, 4846, 4859, 5268, 5728
OFFSET
0,2
FORMULA
From Chai Wah Wu, Feb 03 2021: (Start)
a(n) = - 2*a(n-2) + 2*a(n-3) + 4*a(n-5) + a(n-6) - a(n-8) - 4*a(n-9) - 2*a(n-11) + 2*a(n-12) + a(n-14) for n > 14.
G.f.: (-x^14 - 4*x^13 - 14*x^12 - 32*x^11 - 59*x^10 - 88*x^9 - 116*x^8 - 123*x^7 - 116*x^6 - 88*x^5 - 59*x^4 - 32*x^3 - 14*x^2 - 4*x - 1)/((x - 1)^3*(x + 1)*(x^2 + 1)^3*(x^2 + x + 1)^2). (End)
CROSSREFS
Sequence in context: A008176 A009903 A008048 * A008064 A008159 A057307
KEYWORD
nonn
AUTHOR
Sean A. Irvine, Mar 18 2018
STATUS
approved