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A088969
Triangle T(n,k), read by rows, given by A000290 DELTA [1, 2, 6, 5, 11, 8, 16, 11, 21, 14, 26, 17, 31, 20, 36, ...] where DELTA is the operator defined in A084938.
0
1, 0, 1, 0, 1, 3, 0, 5, 20, 21, 0, 61, 287, 445, 231, 0, 1385, 7244, 13688, 11206, 3453, 0, 50521, 285295, 612556, 631862, 320159, 65271, 0, 2702765, 16195816, 38143429, 45667208, 29860381, 10300476, 1491381
OFFSET
0,6
FORMULA
Row sums : A000657; median Euler numbers (the middle of Arnold's shuttle triangle) Columns : A000007; A000364 (Euler numbers)
EXAMPLE
Triangle begins:
1;
0, 1;
0, 1, 3;
0, 5, 20, 21;
0, 61, 287, 445, 231;
0, 1385, 7244, 13688, 11206, 3453;
0, 50521, 285295, 612556, 631862, 320159, 65271;
0, 2702765, 16195816, 38143429, 45667208, 29860381, 10300476, 1491381;
CROSSREFS
KEYWORD
easy,nonn,tabl
AUTHOR
Philippe Deléham, Oct 29 2003, Nov 07 2007
STATUS
approved