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A175935 Number of lattice paths from (0,0) to (n,n) using steps S={(k,0),(0,k),(r,r)|0<k<=2,0<r<=2} which never go above the line y=x. 4
1, 2, 10, 55, 351, 2401, 17248, 128221, 978082, 7612155, 60204488, 482481220, 3909460725, 31974923487, 263623879118, 2188682538746, 18282238300443, 153537981720402, 1295640515428649, 10980400434511117, 93418283866708579 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
CROSSREFS
Sequence in context: A202365 A330620 A268556 * A216721 A122826 A320129
KEYWORD
nonn
AUTHOR
Eric Werley, Dec 06 2010
STATUS
approved

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Last modified February 22 09:04 EST 2024. Contains 370248 sequences. (Running on oeis4.)