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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.

A219972 Number of tilings of an 8 X n rectangle using straight (3 X 1) trominoes and 2 X 2 tiles.

Table of values

n a(n)
0 1
1 0
2 4
3 19
4 70
5 456
6 2530
7 12343
8 66653
9 372429
10 1910822
11 10162059
12 55583124
13 291195073
14 1550518247
15 8363883923
16 44269140576
17 235940940726
18 1264437357202
19 6723179849519
20 35846240541026
21 191571690239220
22 1020536749613565
23 5442225134864810
24 29051213879574079

List of values

[1, 0, 4, 19, 70, 456, 2530, 12343, 66653, 372429, 1910822, 10162059, 55583124, 291195073, 1550518247, 8363883923, 44269140576, 235940940726, 1264437357202, 6723179849519, 35846240541026, 191571690239220, 1020536749613565, 5442225134864810, 29051213879574079]

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

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