cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A135070 a(n) = [x^(2^n+n-2)] (x + x^2 + x^4 + x^8 + ... + x^(2^n))^n for n>=1.

Table of values

n a(n)
1 1
2 1
3 3
4 18
5 70
6 600
7 4956
8 52528
9 358128
10 6654600
11 79967800
12 1453049400
13 16239408120
14 392541718660
15 5252687631660
16 108961629396480
17 1395025456201408
18 62831427044385384
19 1223872353413404344
20 37391632408971430120
21 655014723078024641640
22 27055523795138159291124
23 547691411941958414420092
24 17365164578604322437671664
25 332211955074827711097949200
26 19385342415197943809053622700
27 466687147661484232610990714436
28 18326221432646410203582181439808

List of values

[1, 1, 3, 18, 70, 600, 4956, 52528, 358128, 6654600, 79967800, 1453049400, 16239408120, 392541718660, 5252687631660, 108961629396480, 1395025456201408, 62831427044385384, 1223872353413404344, 37391632408971430120, 655014723078024641640, 27055523795138159291124, 547691411941958414420092, 17365164578604322437671664, 332211955074827711097949200, 19385342415197943809053622700, 466687147661484232610990714436, 18326221432646410203582181439808]