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A048223 a(n)=T(n,1)+T(n,n), array T given by A048212. 0
4, 4, 11, 19, 29, 39, 54, 72, 89, 113, 137, 163, 189, 216, 254, 288, 323, 363, 402, 446, 495, 544, 593, 651, 710, 772, 835, 898, 964, 1036, 1106, 1185, 1263, 1341, 1420, 1504, 1591, 1681, 1770, 1860, 1963, 2063, 2165, 2271, 2378 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
a(n) = 2*A004979(n+1) - A004979(n) - 1. - Sean A. Irvine, Jun 05 2021
CROSSREFS
Cf. A004979.
Sequence in context: A231064 A302516 A254205 * A358825 A214112 A211950
KEYWORD
nonn
AUTHOR
STATUS
approved

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Last modified July 20 04:43 EDT 2024. Contains 374441 sequences. (Running on oeis4.)