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A083083
A diagonal of number array A083075.
3
1, 7, 97, 1831, 43393, 1242375, 41818561, 1620979687, 71191804801, 3496805826823, 190053352702753, 11329044782441127, 735151931535979777, 51600331868857972231, 3896042468112362132353, 314921475287825567805799
OFFSET
0,2
LINKS
FORMULA
a(n) = ((n+2)*(2n+7)^n + 1)/(n+3).
MATHEMATICA
Table[((n+2)(2n+7)^n+1)/(n+3), {n, 0, 20}] (* Harvey P. Dale, Nov 18 2021 *)
PROG
(Magma) [((n+2)*(2*n+7)^n+1)/(n+3): n in [0..20]]; // Vincenzo Librandi, Nov 12 2011
CROSSREFS
Sequence in context: A371367 A188441 A178808 * A022007 A174516 A058805
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Apr 23 2003
STATUS
approved