A219865 First differences of A219795.

0, 0, 0, 1, 0, 2, 2, 3, 1, 5, 7, 10, 11, 14, 23, 33, 44, 54, 81, 114, 158, 212, 287, 407, 565, 777, 1050, 1471, 2036, 2813, 3863, 5310, 7370, 10183, 14046, 19296, 26726, 36909, 50955, 70251, 96867, 133886, 184841, 255092, 351673

Offset: 0

Author

Paul Curtz, Nov 30 2012

Keywords

• nonn
• less

Comments

2,2,3, 5,7,10,11, 23,33,44, 81,114,158,212, 407,565,777, 1471,2036,2813,3863, 7370,10183,14046, 26726,36909,50955,70251, is a subsequence of A219795(n).

Consider A219795(n) and its successive differences:

2, 2, 2, 2, 3, 3, 5, 7, 10, 11, 16, 23, 33, 44; A219795(n)

0, 0, 0, 1, 0, 2, 2, 3, 1, 5, 7, 10, 11, 14; a(n)

0, 0, 1, -1, 2, 0, 1, -2, 4, 2, 3, 1, 3, 9;

0, 1, -2, 3, -2, 1, -3, 6, -2, 1, -2, 2, 6, 1;

Programs

Maple

A219865 := proc(n)
    A219795(n+1)-A219795(n) ;
end proc: # R. J. Mathar, Jan 06 2013

Formula

a(n) = A219795(n+1) - A219795(n).