OFFSET
0,2
LINKS
Index entries for linear recurrences with constant coefficients, signature (2,0,-2,1).
FORMULA
EXAMPLE
Triangle in A204028 begins:
1;............................sum = 1
1, 1;.........................sum = 2
1, 4, 1;......................sum = 6
1, 4, 4, 1;...................sum = 10
1, 4, 7, 4, 1;................sum = 17
1, 4, 7, 7, 4, 1;.............sum = 24
1, 4, 7, 10, 7, 4, 1;.........sum = 34
1, 4, 7, 10, 10, 7, 4, 1;.....sum = 44
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Philippe Deléham, Feb 25 2014
EXTENSIONS
Corrected by R. J. Mathar, Aug 08 2015
STATUS
approved