|
|
|
|
1, 3, 4, 11, 33, 114, 445, 1923, 9078, 46369, 254297, 1487896, 9239135, 60615819, 418583924, 3032405831, 22979752405, 181697363626, 1495586215841, 12789423056183, 113415288869750, 1041244540823413, 9881851825756365, 96811870321650792, 977851660102425867
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
0,2
|
|
LINKS
|
|
|
FORMULA
|
a(0) = 1, a(1) = 3; a(n) = Sum_{k=1..n} binomial(n-1,k-1) * a(n-k). - Ilya Gutkovskiy, Jul 10 2020
|
|
MAPLE
|
alias(PS = ListTools:-PartialSums):
A038559List := proc(len) local a, k, P, T; a := 3; P := [1]; T := [1];
for k from 1 to len-1 do
T := [op(T), a]; P := PS([a, op(P)]); a := P[-1] od;
|
|
CROSSREFS
|
|
|
KEYWORD
|
easy,nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|