A127228
a(n) = numerator of ((n + 4)! - (n - 4)!)/(n!).
Original entry on oeis.org
40319, 362879, 1814399, 6652799, 19958399, 51891839, 121080959, 259459199, 518918399, 980179199, 1764322559, 3047466239, 5079110399, 8204716799, 12893126399, 19769460479, 29654190719, 43609103999, 62990927999
Offset: 4
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f::= n -> (n+4)*(n+3)*(n+2)*(n+1)*n*(n-1)*(n-2)*(n-3)-1:
map(f, [$4..30]); # Robert Israel, Nov 20 2023
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Table[Numerator[((n + 4)! - (n - 4)!)/(n!)], {n, 4, 30}]
A127230
a(n) = (2n)! - 1.
Original entry on oeis.org
1, 23, 719, 40319, 3628799, 479001599, 87178291199, 20922789887999, 6402373705727999, 2432902008176639999, 1124000727777607679999, 620448401733239439359999, 403291461126605635583999999, 304888344611713860501503999999, 265252859812191058636308479999999
Offset: 1
A127227
a(n)= numerator of ((n + 3)! - (n - 3)!)/(n!).
Original entry on oeis.org
719, 5039, 20159, 60479, 151199, 332639, 665279, 1235519, 2162159, 3603599, 5765759, 8910719, 13366079, 19535039, 27907199, 39070079, 53721359, 72681839, 96909119, 127511999, 165765599, 213127199, 271252799, 342014399, 427517999
Offset: 3
A127231
a(n) = (2n)! + 1.
Original entry on oeis.org
2, 3, 25, 721, 40321, 3628801, 479001601, 87178291201, 20922789888001, 6402373705728001, 2432902008176640001, 1124000727777607680001, 620448401733239439360001, 403291461126605635584000001, 304888344611713860501504000001, 265252859812191058636308480000001
Offset: 0
Showing 1-4 of 4 results.