A083082 First subdiagonal of number array A083075.

1, 5, 61, 1065, 23801, 650893, 21120373, 794552657, 34040573425, 1637411510421, 87420145670573, 5131440522974329, 328542298690792681, 22789709877615373085, 1702810951672313083621, 136361486383932674632353

Offset: 0

Author

Paul Barry, Apr 23 2003

Keywords

• easy
• nonn

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..300

Crossrefs

Cf. A083080, A083083.

Programs

Magma

[((n+1)*(2*n+5)^n+1)/(n+2): n in [0..20]]; // Vincenzo Librandi, Nov 12 2011

Mathematica

Table[((n+1)(2n+5)^n+1)/(n+2),{n,0,20}] (* Harvey P. Dale, Oct 06 2019 *)

Formula

a(n) = ((n+1)*(2n+5)^n + 1)/(n+2).