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A256261
First differences of A256260.
5
1, 4, 4, 12, 4, 12, 20, 28, 4, 12, 20, 28, 20, 44, 68, 60, 4, 12, 20, 28, 20, 44, 68, 60, 20, 44, 68, 92, 116, 140, 164, 124, 4, 12, 20, 28, 20, 44, 68, 60, 20, 44, 68, 92, 116, 140, 164, 124, 20, 44, 68, 92, 116, 140, 164, 188, 212, 236, 260, 284, 308, 332, 356, 252, 4, 12, 20, 28, 20, 44, 68, 60, 20, 44, 68, 92, 116, 140
OFFSET
0,2
COMMENTS
First 27 terms agree with A169708. Both sequences share infinitely many terms.
FORMULA
a(n) = 4*A256263(n), n >= 1.
EXAMPLE
Written as an irregular triangle in which the row lengths are the terms of A011782, the sequence begins:
1;
4;
4,12;
4,12,20,28;
4,12,20,28,20,44,68,60;
4,12,20,28,20,44,68,60,20,44,68,92,116,140,164,124;
4,12,20,28,20,44,68,60,20,44,68,92,116,140,164,124,20,44,68,92,116,140,164,188,212,236,260,284,308,332,356,252;
...
It appears that the row sums give A000302.
It appears that the right border gives A173033.
KEYWORD
nonn,tabf
AUTHOR
Omar E. Pol, Mar 30 2015
STATUS
approved