A083071 First subdiagonal of number array A083064.

1, 3, 19, 173, 2001, 28087, 465011, 8888889, 192922993, 4690709411, 126370284195, 3738060156613, 120478742327009, 4203359652212463, 157854212399438371, 6349779403743490289, 272416890591642213921, 12417347368421052631579

Offset: 0

Author

Paul Barry, Apr 21 2003

Keywords

• easy
• nonn

Crossrefs

Cf. A083069, A083070.

Formula

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