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A139761 as a simple table

na(n)
00
10
20
30
41
55
615
735
870
9127
10220
11385
12715
131430
143004
156385
1613380
1727370
1854740
19107883
20211585
21416405
22826045
231652090
243321891
256690150
2613455325
2726985675
2853971350
29107746282
30214978335
31429124630
32857417220
331714834440
343431847189

[0,0,0,0,1,5,15,35,70,127,220,385,715,1430,3004,
 6385,13380,27370,54740,107883,211585,416405,
 826045,1652090,3321891,6690150,13455325,26985675,
 53971350,107746282,214978335,429124630,857417220,
 1714834440,3431847189]