A023491 a(n) = b(n) + d(n), where b(n) = (n-th Fibonacci number > 1) and d(n) = (n-th non-Lucas number).

4, 8, 11, 16, 22, 31, 46, 68, 103, 159, 249, 394, 629, 1007, 1618, 2606, 4204, 6789, 10971, 17737, 28684, 46396, 75055, 121424, 196450, 317844, 514263, 832075, 1346305, 2178346, 3524616, 5702926, 9227505, 14930393, 24157859, 39088212, 63246030, 102334200

Offset: 0

Author

Clark Kimberling

Keywords

• nonn

Formula

a(n) = A000045(n+3)+A090946(n+2). - R. J. Mathar, Feb 01 2019

Extensions

Corrected by Clark Kimberling, Jan 29 2019