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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.

A274763 Number of linear extensions of the one-level grid poset G[(1^n), (1^(n-1)), (0^(n-1))].

Table of values

n a(n)
1 1
2 10
3 215
4 7200
5 328090
6 18914190
7 1318595475
8 107813147200
9 10112867995550
10 1070215246700100
11 126122386636230950
12 16378717184245443000
13 2323753119238888045500
14 357594668486650175355750
15 59323244552378848484536875
16 10553747415214416889115286000
17 2004246729406751177924041663750
18 404685181230584369889138573637500
19 86569650968075614116679243211951250
20 19558042902565983702641321883519060000

List of values

[1, 10, 215, 7200, 328090, 18914190, 1318595475, 107813147200, 10112867995550, 1070215246700100, 126122386636230950, 16378717184245443000, 2323753119238888045500, 357594668486650175355750, 59323244552378848484536875, 10553747415214416889115286000, 2004246729406751177924041663750, 404685181230584369889138573637500, 86569650968075614116679243211951250, 19558042902565983702641321883519060000]

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

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