A083080 Main diagonal of number array A083075.

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

Offset

0,2

Links

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

Formula

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

Prog

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

Crossrefs

Cf. A083081, A083082.

Sequence in context: A291818 A209245 A092170 * A002916 A009659 A367427

Adjacent sequences: A083077 A083078 A083079 * A083081 A083082 A083083

Keyword

easy,nonn

Author

Paul Barry, Apr 23 2003

Status

approved