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A261519 as a simple table

n a(n)
0 1
1 4
2 16
3 60
4 208
5 692
6 2224
7 6940
8 21152
9 63188
10 185488
11 536268
12 1529648
13 4310804
14 12017264
15 33171916
16 90745472
17 246201412
18 662897232
19 1772295020
20 4707336848
21 12426673188
22 32617079280
23 85152717404
24 221183486496
25 571784014244
26 1471463190032
27 3770577250716

[1,4,16,60,208,692,2224,6940,21152,63188,185488,
 536268,1529648,4310804,12017264,33171916,90745472,
 246201412,662897232,1772295020,4707336848,
 12426673188,32617079280,85152717404,221183486496,
 571784014244,1471463190032,3770577250716]

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Last modified May 8 00:02 EDT 2024. Contains 372317 sequences. (Running on oeis4.)