login
A360488
31-gonal numbers: a(n) = n*(29*n-27)/2.
0
0, 1, 31, 90, 178, 295, 441, 616, 820, 1053, 1315, 1606, 1926, 2275, 2653, 3060, 3496, 3961, 4455, 4978, 5530, 6111, 6721, 7360, 8028, 8725, 9451, 10206, 10990, 11803, 12645, 13516, 14416, 15345, 16303, 17290, 18306, 19351, 20425, 21528, 22660, 23821, 25011, 26230
OFFSET
0,3
FORMULA
G.f.: x*(1 + 28*x)/(1 - x)^3.
E.g.f.: exp(x)*(x + 29*x^2/2).
MATHEMATICA
Table[n (29 n - 27)/2, {n, 0, 30}]
CROSSREFS
KEYWORD
nonn
AUTHOR
Nikolaos Pantelidis, Feb 09 2023
STATUS
approved