A083080 Main diagonal of number array A083075.

1, 3, 33, 547, 11713, 309411, 9763393, 359046339, 15096500481, 714852041923, 37660464739681, 2185503641764323, 138548894120306881, 9527726662032987747, 706481006206076565633, 56192761405186331759491

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. A083081, A083082.

Programs

Magma

[(n*(2*n+3)^n+1)/(n+1): n in [0..20]]; // Vincenzo Librandi, Nov 12 2011

Formula

a(n) = (n*(2n+3)^n + 1)/(n+1).