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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
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| a(n)=T(n, n), where T(n, 0)=floor(n*x/(x-1))+1, T(n, k+1)=ceil(x*T(n, k)), for n>=0, k>=0, where x=1+sqrt(2).
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CROSSREFS
| Cf. A083087, A083044, A083047, A083050.
Sequence in context: A147274 A147034 A146460 * A147177 A057255 A134140
Adjacent sequences: A083087 A083088 A083089 * A083091 A083092 A083093
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KEYWORD
| nonn
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AUTHOR
| Paul D. Hanna (pauldhanna(AT)juno.com), Apr 22 2003
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