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A083081 First super-diagonal of number array A083075. 3
1, 13, 229, 4921, 128841, 4022341, 146450893, 6103787761, 286833509137, 15011892880381, 866190689012661, 54637591044108073, 3740820141248285785, 276304073198956644661, 21900911192388373534621 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 1..300

FORMULA

a(n) = ((n-1)*(2n+1)^n + 1)/n.

PROG

(MAGMA) [((n-1)*(2*n+1)^n+1)/n: n in [1..20]]; // Vincenzo Librandi, Nov 12 2011

CROSSREFS

Cf. A083080, A083082.

Sequence in context: A223548 A201706 A176722 * A083306 A114755 A142610

Adjacent sequences:  A083078 A083079 A083080 * A083082 A083083 A083084

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Apr 23 2003

STATUS

approved

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Last modified August 1 15:44 EDT 2021. Contains 346393 sequences. (Running on oeis4.)