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A190795
Number of two-sided n-step prudent walks ending on the top side or the right side of their boxes, avoiding two consecutive west steps and south steps.
0
1, 4, 8, 22, 52, 130, 316, 774, 1884, 4588, 11152, 27088, 65730, 159388, 386248, 935496, 2264662, 5479952
OFFSET
1,2
CROSSREFS
Sequence in context: A322284 A175655 A000639 * A052528 A058855 A297339
KEYWORD
nonn,walk,more
AUTHOR
Shanzhen Gao, May 20 2011
STATUS
approved