A100730 Fundamental difference of Ulam 1-additive sequence starting U(2,2n+1).

126, 126, 1778, 6510, 23622, 510, 507842, 1523526, 8388606, 4194302, 597870, 35791394, 21691754, 2046, 511305630, 45678505642, 51539607546, 640638112422, 2748779069430, 25563645345606, 46912496118442, 80418967640942

Offset: 2

Author

Ralf Stephan, Dec 03 2004

Keywords

• nonn

Links

• Max Alekseyev, Table of n, a(n) for n = 2..610
• M. Akeran, On some 1-additive sequences
• S. R. Finch, Patterns in 1-additive sequences, Experimental Mathematics 1 (1992), 57-63.

Crossrefs

Cf. A100729 for the period, A001857 for U(2, 3), A007300 for U(2, 5), A003668 for U(2, 7).

Formula

a(n) = 2 * A046932(2*n+2)

Extensions

2 more terms from Balakrishnan V (balaji.iitm1(AT)gmail.com), Nov 15 2007

Further new terms and b-file from Max Alekseyev, Dec 01 2007

b-file extended by Max Alekseyev, Aug 17 2015