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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.

A377220 Expansion of (1/x) * series_reversion(x*E_4(x)), where E_4(x) denotes the Eisenstein series of weight 4 (see A004009).

Table of values

n a(n)
0 1
1 -240
2 113040
3 -66534720
4 43859560080
5 -30976854078240
6 22919806575299520
7 -17536455012714130560
8 13761543459443537811600
9 -11015192093055645841813680
10 8958361831335008460574345440
11 -7381454927286057227098811282880
12 6148958599311807793865548969813440
13 -5169975617288319668409172392988655520

List of values

[1, -240, 113040, -66534720, 43859560080, -30976854078240, 22919806575299520, -17536455012714130560, 13761543459443537811600, -11015192093055645841813680, 8958361831335008460574345440, -7381454927286057227098811282880, 6148958599311807793865548969813440, -5169975617288319668409172392988655520]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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