OFFSET
1,3
REFERENCES
D. Shanks. "Generalized Euler and Class Numbers." Math. Comput. 21, 689-694, 1967. Math. Comput. 22, 699, 1968.
LINKS
Lars Blomberg, Table of n, a(n) for n = 1..5050
D. Shanks, Generalized Euler and class numbers, Math. Comp. 21 (1967), 689-694; 22 (1968), 699. [Annotated scanned copy]
FORMULA
Shanks gives recurrences.
EXAMPLE
The array begins:
A000182: 1, 2, 16, 272, 7936, 353792, ...
A000464: 1, 11, 361, 24611, 2873041, 512343611, ...
A000191: 2, 46, 3362, 515086, 135274562, 54276473326, ...
A000318: 4,128, 16384, 4456448, 2080374784, 1483911200768, ...
A000320: 4,272, 55744, 23750912, 17328937984, 19313964388352, ...
A000411: 6,522,152166, 93241002, 97949265606,157201459863882, ...
A064072: 8,904,355688,296327464,423645846728,925434038426824, ...
...
MATHEMATICA
amax = nmax = 10; km0 = 10; Clear[dd]; L[a_, s_, km_] := Sum[JacobiSymbol[ -a, 2k+1]/(2k+1)^s, {k, 0, km}]; d[1, n_, km_] := 2(2n-1)! L[-1, 2n, km] (2/Pi)^(2n) // Round; d[a_ /; a>1, n_, km_] := (2n-1)! L[-a, 2n, km] (2a/ Pi)^(2n)/Sqrt[a] // Round; dd[km_] := dd[km] = Table[d[a, n, km], {a, 1, amax}, {n, 1, nmax}]; dd[km0]; dd[km = 2km0]; While[dd[km] != dd[km/2, km = 2km]]; A235606 = dd[km]; Table[A235606[[ a-n+1, n]], {a, 1, amax}, {n, 1, a}] // Flatten (* Jean-François Alcover, Feb 05 2016 *)
CROSSREFS
Cf. A235605.
KEYWORD
nonn,tabl
AUTHOR
N. J. A. Sloane, Jan 22 2014
EXTENSIONS
More terms from Lars Blomberg, Sep 07 2015
STATUS
approved