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A218051 as a simple table

n a(n)
1 4
2 4
3 16
4 36
5 94
6 236
7 602
8 1528
9 3882
10 9858
11 25038
12 63592
13 161514
14 410218
15 1041884
16 2646208
17 6720920
18 17069998
19 43354902
20 110114102
21 279671154
22 710317326
23 1804085608
24 4582071648
25 11637685314
26 29557748082
27 75071670020
28 190669317026

[4,4,16,36,94,236,602,1528,3882,9858,25038,63592,
 161514,410218,1041884,2646208,6720920,17069998,
 43354902,110114102,279671154,710317326,1804085608,
 4582071648,11637685314,29557748082,75071670020,
 190669317026]

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Last modified February 7 15:57 EST 2023. Contains 360127 sequences. (Running on oeis4.)