A236148 - OEIS

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A236148 as a simple table

n	a(n)
1	81
2	414
3	2148
4	11064
5	57132
6	294648
7	1520856
8	7845624
9	40488216
10	208893336
11	1077925704
12	5561714424
13	28698381576
14	148076913912
15	764063601480
16	3942427621752
17	20342443076808
18	104963700280056
19	541598357861448

[81,414,2148,11064,57132,294648,1520856,7845624, 40488216,208893336,1077925704,5561714424, 28698381576,148076913912,764063601480, 3942427621752,20342443076808,104963700280056, 541598357861448]