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A267180
Triangle read by rows: T(n,k) = number of rooted maps with n edges on a nonorientable surface of genus k (1 <= k <= n).
4
1, 10, 4, 98, 84, 41, 982, 1340, 1380, 488, 10062, 19280, 31225, 23320, 8229, 105024, 263284, 592824, 696912, 516958, 164892, 1112757, 3486224, 10185056, 16662492, 19381145, 12980716, 4016613, 11934910, 45247084, 164037704, 348539072, 562395292, 590136856, 382630152, 112818960
OFFSET
1,2
REFERENCES
David M. Jackson and Terry I. Visentin, An Atlas of the Smaller Maps in Orientable and Nonorientable Surfaces, Chapman & Hall/CRC, circa 2000. See page 227.
EXAMPLE
Triangle begins:
1,
10,4,
98,84,41,
982,1340,1380,488,
10062,19280,31225,23320,8229,
105024,263284,592824,696912,516958,164892,
1112757,3486224,10185056,16662492,19381145,12980716,4016613,
11934910,45247084,164037704,348539072,562395292,590136856,382630152,112818960
...
CROSSREFS
See A238396 for analog for orientable surfaces.
Columns give A007137, A006344.
Sequence in context: A180866 A232908 A216653 * A038306 A317597 A357423
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Jan 16 2016
STATUS
approved