A083072 A subdiagonal of number array A083064.

1, 4, 29, 286, 3511, 51668, 888889, 17538454, 390892451, 9720791092, 267004296901, 8031916155134, 262709978263279, 9285541905849316, 352765522430193905, 14337731083770642838, 620867368421052631579

Offset: 0

Author

Paul Barry, Apr 21 2003

Keywords

• easy
• nonn

Crossrefs

Cf. A083071, A083069.

Formula

a(n) = ((n+2)*(n+4)^n + 1)/(n+3).