A091523 Graham-Pollak sequence with initial term 8.

8, 12, 17, 24, 34, 48, 68, 96, 136, 193, 273, 386, 546, 772, 1092, 1545, 2185, 3090, 4370, 6180, 8740, 12360, 17480, 24721, 34961, 49443, 69923, 98886, 139846, 197772, 279692, 395544, 559384, 791089, 1118769, 1582179, 2237539, 3164358

Offset

1,1

Comments

For n>=3, a(n) = sqrt(2*a(n-1)^2 + (-2)^(n-3)), with a(2) = 12. Unlike the Graham-Pollack formula given in A001521, this formula does not use the floor function. - Richard R. Forberg, Aug 20 2013

Links

Seiichi Manyama, Table of n, a(n) for n = 1..500

Th. Stoll, On Families of Nonlinear Recurrences Related to Digits, Journal of Integer Sequences, Vol. 8 (2005), Article 05.3.2.

Eric Weisstein's World of Mathematics, Graham-Pollak Sequence

Formula

See A001521.

Crossrefs

Cf. A001521, A091522.

Sequence in context: A331863 A175975 A030752 * A257162 A352880 A104201

Adjacent sequences: A091520 A091521 A091522 * A091524 A091525 A091526

Keyword

nonn

Author

Eric W. Weisstein, Jan 18 2004

Status

approved