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A276289 as a simple table

n a(n)
0 0
1 1
2 7
3 30
4 104
5 320
6 912
7 2464
8 6400
9 16128
10 39680
11 95744
12 227328
13 532480
14 1232896
15 2826240
16 6422528
17 14483456
18 32440320
19 72220672
20 159907840
21 352321536
22 772800512
23 1688207360
24 3674210304
25 7969177600
26 17230200832
27 37144756224
28 79859548160
29 171261820928
30 366414397440

[0,1,7,30,104,320,912,2464,6400,16128,39680,95744,
 227328,532480,1232896,2826240,6422528,14483456,
 32440320,72220672,159907840,352321536,772800512,
 1688207360,3674210304,7969177600,17230200832,
 37144756224,79859548160,171261820928,366414397440]

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Last modified May 20 20:16 EDT 2019. Contains 323426 sequences. (Running on oeis4.)