A083073 A subdiagonal of number array A083064.

1, 5, 41, 439, 5741, 88889, 1594405, 32574371, 747753161, 19071735493, 535461077009, 16419373641455, 546208347402901, 19598084579455217, 754617425461612781, 31043368421052631579, 1359040255729886061905, 63095193256628031573821, 3096689504900009726877625

Offset

0,2

Links

Table of n, a(n) for n=0..18.

Formula

a(n) = ((n+3)*(n+5)^n + 1)/(n+4).

a(n) ~ exp(5-25/(2*n)) * n^n. - Amiram Eldar, Feb 06 2026

Mathematica

a[n_] := ((n+3)*(n+5)^n + 1)/(n+4); Array[a, 20, 0] (* Amiram Eldar, Feb 06 2026 *)

Crossrefs

Cf. A083064, A083072, A083071, A083069.

Sequence in context: A140095 A259609 A323213 * A379879 A115257 A225095

Adjacent sequences: A083070 A083071 A083072 * A083074 A083075 A083076

Keyword

easy,nonn

Author

Paul Barry, Apr 21 2003

Status

approved