A109947 - OEIS

The OEIS is supported by the many generous donors to the OEIS Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

Other ways to Give

A109947 as a simple table

n	a(n)
1	2
2	13
3	739
4	4937
5	24691
6	123457
7	29629609
8	24691357
9	1234567891
10	530864193131
11	12345678910111
12	1851851836516681
13	74074073460667279
14	76543209242689521469
15	8395061658875624936221
16	123456789101112131415161

[2,13,739,4937,24691,123457,29629609,24691357, 1234567891,530864193131,12345678910111, 1851851836516681,74074073460667279, 76543209242689521469,8395061658875624936221, 123456789101112131415161]