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A083090
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Main diagonal of table A083087.
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1
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1, 5, 25, 90, 247, 766, 2258, 5860, 16526, 45639, 124043, 313327, 837221, 2216256, 5545541, 14524810, 37810204, 97907017, 242993558, 625252309, 1602714963, 3962518559, 10109705767, 25718726896, 63402237401, 160711911464
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history;
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internal format)
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OFFSET
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0,2
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LINKS
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Table of n, a(n) for n=0..25.
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FORMULA
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a(n) = T(n, n), where T(n, 0) = floor(n*x/(x-1)) + 1, T(n, k+1) = ceiling(x*T(n, k)), for n >= 0, k >= 0, where x = 1+sqrt(2).
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CROSSREFS
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Cf. A083087, A083044, A083047, A083050.
Sequence in context: A147034 A146460 A223840 * A224148 A265929 A297452
Adjacent sequences: A083087 A083088 A083089 * A083091 A083092 A083093
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KEYWORD
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nonn
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AUTHOR
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Paul D. Hanna, Apr 22 2003
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STATUS
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approved
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