A343208 - cp's OEIS frontend

A343208 a(n) = Sum_{k=1..n} kA001168(k)binomial(n-1,k-1), where A001168(k) is the number of fixed polyominoes with k cells.

n	a(n)
1	1
2	5
3	27
4	143
5	744
6	3832
7	19636
8	100348
9	511969
10	2608905
11	13282011
12	67567527
13	343510966
14	1745495390
15	8865633276
16	45013599940
17	228478238613
18	1159398424925
19	5881978415019
20	29835289653043
21	151308803657699
22	767245632538063
23	3889991549017581
24	19720295705928713
25	99961847384995974

[1, 5, 27, 143, 744, 3832, 19636, 100348, 511969, 2608905, 13282011, 67567527, 343510966, 1745495390, 8865633276, 45013599940, 228478238613, 1159398424925, 5881978415019, 29835289653043, 151308803657699, 767245632538063, 3889991549017581, 19720295705928713, 99961847384995974]

cp's OEIS Frontend

A343208 a(n) = Sum_{k=1..n} kA001168(k)binomial(n-1,k-1), where A001168(k) is the number of fixed polyominoes with k cells.

Table of values

List of values

cp's OEIS Frontend

A343208 a(n) = Sum_{k=1..n} k*A001168(k)*binomial(n-1,k-1), where A001168(k) is the number of fixed polyominoes with k cells.

Table of values

List of values

A343208 a(n) = Sum_{k=1..n} kA001168(k)binomial(n-1,k-1), where A001168(k) is the number of fixed polyominoes with k cells.