A015499 a(0)=1, a(1)=11, a(n) = sum_{k=0}^{k=n-1} 11^k a(k).

1, 11, 122, 14884, 19825488, 290284795296, 46750946852011392, 82822200907043005634304, 1613970474494103062192651148288, 345968906493565448004393168763031894016, 815776584570266460972904878145357549417415811072

Offset: 0

Author

Olivier Gérard

Keywords

• nonn
• easy

Programs

Magma

I:=[1, 11, 122]; [n le 3 select I[n] else (11^(n-2)+1)*Self(n-1): n in [1..15]]; // Vincenzo Librandi, Nov 11 2012

Formula

a(n) = (11^(n-2) + 1) * a(n-1). - Vincenzo Librandi, Nov 11 2012