|
| |
|
|
A100154
|
|
Structured truncated icosahedral numbers.
|
|
3
|
|
|
|
1, 60, 282, 772, 1635, 2976, 4900, 7512, 10917, 15220, 20526, 26940, 34567, 43512, 53880, 65776, 79305, 94572, 111682, 130740, 151851, 175120, 200652, 228552, 258925, 291876, 327510, 365932, 407247, 451560, 498976, 549600
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
|
OFFSET
|
1,2
|
|
|
LINKS
|
|
|
|
FORMULA
|
a(n) = (1/2)*n*(35*n^2 - 47*n + 14).
G.f.: x*(1 + 56*x + 48*x^2)/(1-x)^4. - Colin Barker, Feb 12 2012
|
|
|
PROG
|
(Magma) [(1/6)*(105*n^3-141*n^2+42*n): n in [1..40]]; // Vincenzo Librandi, Jul 19 2011
|
|
|
CROSSREFS
|
Cf. A100153, A100155 for adjacent structured Archimedean solids; A100145 for more on structured polyhedral numbers.
|
|
|
KEYWORD
|
easy,nonn
|
|
|
AUTHOR
|
James A. Record (james.record(AT)gmail.com), Nov 07 2004
|
|
|
STATUS
|
approved
|
| |
|
|
